PROBLEM: megaraid2 performance problems with 2.4.32

From: Arthur de Jong
Date: Mon Feb 06 2006 - 05:52:47 EST

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Sorry to send this mail to so many people. Feel free to ignore this if
you don't think it's appropriate for you.

[1.] One line summary of the problem:

The megaraid2 driver from the 2.4.32 kernel has horrible performance
compared to the 2.4.31 one.

[2.] Full description of the problem/report:

When upgrading kernels we noticed a steep drop in transfer rate from our
scsi tape to our scsi disk (all non-raid (raid 0 logical devices) but
using the Dell MegaRAID 518 DELL PERC 4/DC RAID Controller). The
performance drops from 24MByte/second to ** 2MByte/second when
performing a restore (tar) from tape to disk.

Our kernels are patched with the ghosting patch
(http://www.kernel.org/pub/linux/daemons/autofs/v4/autofs4-2.4.29-20050404.patch) and an ipmi patch (http://linux.dell.com/files/ipmi/ipmi_kcs_drv.patch). I believe both patches are irrelevant to these problems.

We tested with 2.4.31 (with mentioned patches) and the performance is
ok. With 2.4.32 the performance is bad. Copying
drivers/scsi/megaraid2.[ch] from 2.4.31 to 2.4.32 results is a usable
kernel with ok performance.

[3.] Keywords (i.e., modules, networking, kernel):

megaraid2, 2.4.32

[4.] Kernel version (from /proc/version):

Linux version 2.4.32-exp (root@turin) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Mon Jan 9 14:51:07 CET 2006

[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)
n/a

[6.] A small shell script or example program which triggers the
problem (if possible)

Two test runs transferring 10GByte of data. These results were done on
2.4.31 and 2.4.32 kernels with identical .config and building tools. The
filesystem type used was reiserfs. Activity on the system was comparable
with all tests (not single user mode though).

** 2.4.31 kernel tests

# uname -r
2.4.31-pe1850
# rm -f test.file
# time dd if=/dev/zero of=test.file bs=32k count=327680
327680+0 records in
327680+0 records out
10737418240 bytes transferred in 199.794846 seconds (53742218 bytes/sec)

real 3m19.796s
user 0m0.290s
sys 0m50.520s
# mt -f /dev/st0 rewind ; mt -f /dev/nst0 fsf 1
# time dd if=/dev/nst0 of=/dev/null bs=32k count=327680
327680+0 records in
327680+0 records out
10737418240 bytes transferred in 250.968109 seconds (42783995 bytes/sec)

real 4m10.977s
user 0m0.220s
sys 0m4.090s
# mt -f /dev/st0 rewind ; mt -f /dev/nst0 fsf 1
rm -f test.file
# rm -f test.file
# time dd if=/dev/nst0 of=test.file bs=32k count=327680
327680+0 records in
327680+0 records out
10737418240 bytes transferred in 422.225318 seconds (25430541 bytes/sec)

real 7m2.235s
user 0m0.270s
sys 0m50.590s

** 2.4.32 kernel tests

# uname -r
2.4.32-pe1850
# rm -f test.file
g# time dd if=/dev/zero of=test.file bs=32k count=327680
327680+0 records in
327680+0 records out
10737418240 bytes transferred in 210.005062 seconds (51129331 bytes/sec)

real 3m30.006s
user 0m0.270s
sys 0m49.850s
# mt -f /dev/st0 rewind ; mt -f /dev/nst0 fsf 1
# time dd if=/dev/nst0 of=/dev/null bs=32k count=327680
327680+0 records in
327680+0 records out
10737418240 bytes transferred in 4967.018522 seconds (2161743 bytes/sec)

real 82m47.072s
user 0m0.200s
sys 0m3.640s

(the tape to disk test was skipped, if it's really relevant I can rerun
the test)

And in friendly table format:

2.4.31 disk tape tape->disk
rate 51.3M/s 40.8M/s 24.3M/s
real time 3m19.796s 4m10.977s 7m2.235s
user time 0m0.290s 0m0.220s 0m0.270s
sys time 0m50.520s 0m4.090s 0m50.590s

2.4.32 disk tape tape->disk
rate 48.8M/s 2.0M/s
real time 3m30.006s 82m47.072s
user time 0m0.270s 0m0.200s
sys time 0m49.850s 0m3.640s

[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)

Linux turin 2.4.32-exp #1 SMP Mon Jan 9 14:51:07 CET 2006 i686 GNU/Linux

Gnu C 3.3.5
Gnu make 3.80
util-linux 2.12p
mount 2.12p
modutils 2.4.26
e2fsprogs 1.37
Linux C Library 2.3.2
Dynamic linker (ldd) 2.3.2
Procps 3.2.1
Net-tools 1.60
Console-tools 0.2.3
Sh-utils 5.2.1
Modules Loaded st nfsd autofs4 nfs lockd sunrpc i810_rng
ehci-hcd usb-uhci usbcore ide-scsi e1000 ipmi_devintf ipmi_kcs_drv
ipmi_msghandler ipv6 i2c-proc i2c-core ide-disk ide-detect ide-cd cdrom
ide-core unix

[7.2.] Processor information (from /proc/cpuinfo):

processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 2.80GHz
stepping : 3
cpu MHz : 2793.274
cache size : 16 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
pni monitor ds_cpl cid
bogomips : 5570.56

processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 2.80GHz
stepping : 3
cpu MHz : 2793.274
cache size : 16 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
pni monitor ds_cpl cid
bogomips : 5583.66

processor : 2
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 2.80GHz
stepping : 3
cpu MHz : 2793.274
cache size : 16 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
pni monitor ds_cpl cid
bogomips : 5583.66

processor : 3
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Xeon(TM) CPU 2.80GHz
stepping : 3
cpu MHz : 2793.274
cache size : 16 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm
pni monitor ds_cpl cid
bogomips : 5583.66

[7.3.] Module information (from /proc/modules):

st 29560 0 (autoclean)
nfsd 74032 8 (autoclean)
autofs4 13112 6
nfs 77240 3 (autoclean)
lockd 49744 1 (autoclean) [nfsd nfs]
sunrpc 74272 1 (autoclean) [nfsd nfs lockd]
i810_rng 2788 0 (unused)
ehci-hcd 18956 0 (unused)
usb-uhci 24176 0 (unused)
usbcore 66188 1 [ehci-hcd usb-uhci]
ide-scsi 10320 0
e1000 74380 1
ipmi_devintf 3752 0 (unused)
ipmi_kcs_drv 10121 0 (unused)
ipmi_msghandler 14152 0 [ipmi_devintf ipmi_kcs_drv]
ipv6 218772 -1
i2c-proc 6704 0 (unused)
i2c-core 13860 0 [i2c-proc]
ide-disk 15904 0
ide-detect 288 0 (unused)
ide-cd 31264 0
cdrom 29696 0 [ide-cd]
ide-core 111352 0 [ide-scsi ide-disk ide-detect ide-cd]
unix 16976 21 (autoclean)

[7.4.] Loaded driver and hardware information
(/proc/ioports, /proc/iomem)

/proc/ioports:
0000-001f : dma1
0020-003f : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(auto)
0800-0803 : PM1a_EVT_BLK
0804-0805 : PM1a_CNT_BLK
0808-080b : PM_TMR
0828-082f : GPE0_BLK
0ca8-0ca8 : ipmi_kcs
0cac-0cac : ipmi_kcs
0cf8-0cff : PCI conf1
bca0-bcbf : Intel Corp. 82801EB USB
bca0-bcbf : usb-uhci
bcc0-bcdf : Intel Corp. 82801EB USB
bcc0-bcdf : usb-uhci
bce0-bcff : Intel Corp. 82801EB USB
bce0-bcff : usb-uhci
cc00-ccff : ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]
d000-efff : PCI Bus #05
d000-dfff : PCI Bus #07
dcc0-dcff : PCI device 8086:1076 (Intel Corp.)
dcc0-dcff : e1000
e000-efff : PCI Bus #06
ecc0-ecff : PCI device 8086:1076 (Intel Corp.)
ecc0-ecff : e1000
fc00-fc0f : Intel Corp. 82801EB Ultra ATA Storage Controller

/proc/iomem:
00000000-0009ffff : System RAM
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000cb000-000cbfff : Extension ROM
000cc000-000ccfff : Extension ROM
000cd000-000cf1ff : Extension ROM
000cf800-000d1dff : Extension ROM
000f0000-000fffff : System ROM
00100000-3ffbffff : System RAM
00100000-0028dde7 : Kernel code
0028dde8-00319f23 : Kernel data
3ffc0000-3ffcfbff : ACPI Tables
3ffcfc00-3fffefff : reserved
3ffff000-3ffff3ff : Intel Corp. 82801EB Ultra ATA Storage Controller
e0000000-efffffff : reserved
f0000000-f7ffffff : ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]
f8000000-f81fffff : PCI Bus #01
f8000000-f80fffff : PCI Bus #03
f80f0000-f80fffff : LSI Logic / Symbios Logic PowerEdge Expandable RAID Controller 4
f80f0000-f80f007f : MegaRAID: LSI Logic Corporation.
f8100000-f81fffff : PCI Bus #02
f81f0000-f81fffff : PCI device 1028:0013 (Dell Computer Corporation)
f81f0000-f81f007f : MegaRAID: LSI Logic Corporation.
fe0f0000-fe0fffff : ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]
fe200000-fe6fffff : PCI Bus #05
fe300000-fe4fffff : PCI Bus #07
fe3e0000-fe3fffff : PCI device 8086:1076 (Intel Corp.)
fe3e0000-fe3fffff : e1000
fe500000-fe6fffff : PCI Bus #06
fe5e0000-fe5fffff : PCI device 8086:1076 (Intel Corp.)
fe5e0000-fe5fffff : e1000
fe700000-feafffff : PCI Bus #01
fe800000-fe8fffff : PCI Bus #03
fe900000-feafffff : PCI Bus #02
fe9e0000-fe9fffff : PCI device 1028:0013 (Dell Computer Corporation)
feb00000-feb003ff : Intel Corp. 82801EB USB2
feb00000-feb003ff : ehci_hcd
fec00000-fec8ffff : reserved
fed00000-fed003ff : reserved
fee00000-fee0ffff : reserved
ffb00000-ffffffff : reserved

[7.5.] PCI information ('lspci -vvv' as root)

0000:00:00.0 Host bridge: Intel Corp. Server Memory Controller Hub (rev 09)
Subsystem: Dell: Unknown device 016c
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: [40] #09 [4105]

0000:00:02.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express Port A0 (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=00, secondary=01, subordinate=03, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: fe700000-feafffff
Prefetchable memory behind bridge: 00000000f8000000-00000000f8100000
Secondary status: SERR
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Message Signalled Interrupts: 64bit- Queue=0/1 Enable-
Address: fee00000 Data: 0000
Capabilities: [64] #10 [0041]

0000:00:04.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express Port B0 (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: fff00000-000fffff
Prefetchable memory behind bridge: 00000000fff00000-0000000000000000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Message Signalled Interrupts: 64bit- Queue=0/1 Enable-
Address: fee00000 Data: 0000
Capabilities: [64] #10 [0041]

0000:00:05.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express Port B1 (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=00, secondary=05, subordinate=07, sec-latency=0
I/O behind bridge: 0000d000-0000efff
Memory behind bridge: fe200000-fe6fffff
Prefetchable memory behind bridge: 00000000fff00000-0000000000000000
Secondary status: SERR
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Message Signalled Interrupts: 64bit- Queue=0/1 Enable-
Address: fee00000 Data: 0000
Capabilities: [64] #10 [0041]

0000:00:06.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express Port C0 (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=00, secondary=08, subordinate=08, sec-latency=0
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: fff00000-000fffff
Prefetchable memory behind bridge: 00000000fff00000-0000000000000000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] Message Signalled Interrupts: 64bit- Queue=0/1 Enable-
Address: fee00000 Data: 0000
Capabilities: [64] #10 [0041]

0000:00:1d.0 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1 (rev 02) (prog-if 00 [UHCI])
Subsystem: Dell: Unknown device 016c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 16
Region 4: I/O ports at bce0 [size=32]

0000:00:1d.1 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2 (rev 02) (prog-if 00 [UHCI])
Subsystem: Dell: Unknown device 016c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin B routed to IRQ 19
Region 4: I/O ports at bcc0 [size=32]

0000:00:1d.2 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #3 (rev 02) (prog-if 00 [UHCI])
Subsystem: Dell: Unknown device 016c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin C routed to IRQ 18
Region 4: I/O ports at bca0 [size=32]

0000:00:1d.7 USB Controller: Intel Corp. 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI])
Subsystem: Dell: Unknown device 016c
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin D routed to IRQ 23
Region 0: Memory at feb00000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [58] #0a [20a0]

0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev c2) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=09, subordinate=09, sec-latency=32
I/O behind bridge: 0000c000-0000cfff
Memory behind bridge: fe000000-fe1fffff
Prefetchable memory behind bridge: f0000000-f7ffffff
BridgeCtl: Parity+ SERR+ NoISA- VGA+ MAbort- >Reset- FastB2B-

0000:00:1f.0 ISA bridge: Intel Corp. 82801EB/ER (ICH5/ICH5R) LPC Bridge (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

0000:00:1f.1 IDE interface: Intel Corp. 82801EB/ER (ICH5/ICH5R) Ultra ATA 100 Storage Controller (rev 02) (prog-if 8a [Master SecP PriP])
Subsystem: Dell: Unknown device 016c
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Interrupt: pin A routed to IRQ 0
Region 0: I/O ports at <unassigned>
Region 1: I/O ports at <unassigned>
Region 2: I/O ports at <unassigned>
Region 3: I/O ports at <unassigned>
Region 4: I/O ports at fc00 [size=16]
Region 5: Memory at 3ffff000 (32-bit, non-prefetchable) [disabled] [size=1K]

0000:01:00.0 PCI bridge: Intel Corp. 80332 [Dobson] I/O processor (rev 06) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=01, secondary=02, subordinate=02, sec-latency=64
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: fe900000-feafffff
Prefetchable memory behind bridge: 00000000f8100000-00000000f8100000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [44] #10 [0071]
Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [6c] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d8] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=2
Status: Bus=1 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:01:00.2 PCI bridge: Intel Corp. 80332 [Dobson] I/O processor (rev 06) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=01, secondary=03, subordinate=03, sec-latency=32
I/O behind bridge: 0000f000-00000fff
Memory behind bridge: fe800000-fe8fffff
Prefetchable memory behind bridge: 00000000f8000000-00000000f8000000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [44] #10 [0071]
Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [6c] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d8] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=0
Status: Bus=1 Dev=0 Func=2 64bit- 133MHz- SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:02:0e.0 RAID bus controller: Dell PowerEdge Expandable RAID controller 4 (rev 06)
Subsystem: Dell PowerEdge Expandable RAID Controller 4e/Si
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping+ SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (32000ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 46
Region 0: Memory at f81f0000 (32-bit, prefetchable) [size=64K]
Region 2: Memory at fe9e0000 (32-bit, non-prefetchable) [size=128K]
Expansion ROM at fea00000 [disabled] [size=128K]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d0] Message Signalled Interrupts: 64bit+ Queue=0/1 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [e0] PCI-X non-bridge device.
Command: DPERE- ERO- RBC=0 OST=3
Status: Bus=2 Dev=14 Func=0 64bit+ 133MHz+ SCD- USC-, DC=bridge, DMMRBC=1, DMOST=3, DMCRS=1, RSCEM-

0000:03:0b.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID (rev 01)
Subsystem: Dell MegaRAID 518 DELL PERC 4/DC RAID Controller
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=slow >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32, Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 37
Region 0: Memory at f80f0000 (32-bit, prefetchable) [size=64K]
Expansion ROM at fe800000 [disabled] [size=64K]
Capabilities: [80] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

0000:05:00.0 PCI bridge: Intel Corp. PCI Bridge Hub A (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=05, secondary=06, subordinate=06, sec-latency=32
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: fe500000-fe6fffff
Prefetchable memory behind bridge: 00000000fff00000-0000000000000000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [44] #10 [0071]
Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [6c] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d8] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=0
Status: Bus=5 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:05:00.2 PCI bridge: Intel Corp. PCI Bridge Hub B (rev 09) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 0x10 (64 bytes)
Bus: primary=05, secondary=07, subordinate=07, sec-latency=32
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: fe300000-fe4fffff
Prefetchable memory behind bridge: 00000000fff00000-0000000000000000
BridgeCtl: Parity+ SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: [44] #10 [0071]
Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
Capabilities: [6c] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [d8] PCI-X bridge device.
Secondary Status: 64bit+, 133MHz+, SCD-, USC-, SCO-, SRD- Freq=0
Status: Bus=5 Dev=0 Func=2 64bit- 133MHz- SCD- USC-, SCO-, SRD-
: Upstream: Capacity=65535, Commitment Limit=65535
: Downstream: Capacity=65535, Commitment Limit=65535

0000:06:07.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet Controller (rev 05)
Subsystem: Dell: Unknown device 016d
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (63750ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 64
Region 0: Memory at fe5e0000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at ecc0 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device.
Command: DPERE- ERO+ RBC=0 OST=0
Status: Bus=0 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, DC=simple, DMMRBC=2, DMOST=0, DMCRS=0, RSCEM-

0000:07:08.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet Controller (rev 05)
Subsystem: Dell: Unknown device 016d
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (63750ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 65
Region 0: Memory at fe3e0000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at dcc0 [size=64]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [e4] PCI-X non-bridge device.
Command: DPERE- ERO+ RBC=0 OST=0
Status: Bus=0 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, DC=simple, DMMRBC=2, DMOST=0, DMCRS=0, RSCEM-

0000:09:0d.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE] (prog-if 00 [VGA])
Subsystem: Dell: Unknown device 016c
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop+ ParErr- Stepping+ SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 32 (2000ns min), Cache Line Size: 0x10 (64 bytes)
Interrupt: pin A routed to IRQ 18
Region 0: Memory at f0000000 (32-bit, prefetchable) [size=128M]
Region 1: I/O ports at cc00 [size=256]
Region 2: Memory at fe0f0000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

[7.6.] SCSI information (from /proc/scsi/scsi)

Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: MegaRAID Model: LD 0 RAID1 34G Rev: 521S
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 04 Id: 06 Lun: 00
Vendor: PE/PV Model: 1x2 SCSI BP Rev: 1.0
Type: Processor ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: MegaRAID Model: LD 0 RAID0 139G Rev: 351S
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 01 Lun: 00
Vendor: MegaRAID Model: LD 1 RAID0 139G Rev: 351S
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 02 Lun: 00
Vendor: MegaRAID Model: LD 2 RAID0 34G Rev: 351S
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi1 Channel: 04 Id: 06 Lun: 00
Vendor: DELL Model: PV22XS Rev: E.17
Type: Processor ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 00 Lun: 00
Vendor: ADIC Model: FastStor 2 Rev: G12r
Type: Medium Changer ANSI SCSI revision: 02
Host: scsi1 Channel: 05 Id: 05 Lun: 00
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 01
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 02
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 03
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 04
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 05
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi1 Channel: 05 Id: 05 Lun: 06
Vendor: HP Model: Ultrium 2-SCSI Rev: F53A
Type: Sequential-Access ANSI SCSI revision: 03
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: TEAC Model: DVD-ROM DV-28E-C Rev: D.4E
Type: CD-ROM ANSI SCSI revision: 02

[7.7.] Other information that might be relevant to the problem
(please look in /proc and include all information that you
think to be relevant):

Nothing I can think of. If there is any relevant information needed,
please ask. (nothing in the kernel logs during the poor performance)

[X.] Other notes, patches, fixes, workarounds:

We're staying with the 2.4.31 kernel for now.

--
-- arthur de jong - arthur@xxxxxxx - west consulting b.v. --
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