which max. sustained read performace can be expected with UDMA33 ?
I have a 40GB 7200rpm Maxtor disk which should give min/max 16.7/29.0 MB/sec
accoring to a benchmark test in german c't magazine.
but with DFI K6BV3+ main board (MVP3 chipset, only supports UDMA33 not UDMA66),
AMD K6/2-400, 128MB PC100 ram, 2MB L2 cache only get ~11-14 MB/sec read rate.
I noticed the "maxDMA=0(slow)" in "hdparm -i" output but can't find any
hint how to change this.
is there any chance to improve/tune performace, or is UDMA33 the real limit ?
do I need UDMA66 for 20-30 MB/sec ? why?
from startup (2.3.47):
Uniform Multi-Platform E-IDE driver Revision: 6.30
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: not 100% native mode: will probe irqs later
VT 82C598 Apollo MVP3 Chipset Core ATA-33
Split FIFO Configuration: 16 Primary buffers, threshold = 3/4
0 Second. buffers, threshold = 1/2
ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA
ide0: VIA Bus-Master (U)DMA Timing Config Success
hda: Maxtor 54098U8, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: Maxtor 54098U8, 39082MB w/2048kB Cache, CHS=4982/255/63, UDMA(33)
Partition check:
hda: [EZD] [remap 0->1] [4982/255/63] hda1 hda2 hda3 hda4
# hdparm -tT /dev/hda
/dev/hda:
Timing buffer-cache reads: 64 MB in 0.89 seconds =71.91 MB/sec
Timing buffered disk reads: 32 MB in 2.35 seconds =13.62 MB/sec
# hdparm /dev/hda
/dev/hda:
multcount = 0 (off)
I/O support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4982/255/63, sectors = 80041248, start = 0
# hdparm -i /dev/hda
/dev/hda:
Model=Maxtor 54098U8, FwRev=DA620CQ0, SerialNo=K803ENKC
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=off
DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
CurCHS=4047/16/255, CurSects=16511760, LBA=yes, LBAsects=80041248
tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
Harald
--
All SCSI disks will from now on ___ _____
be required to send an email notice 0--,| /OOOOOOO\
24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\
\ \/OOOOOOOOOOOOOOO\
\ OOOOOOOOOOOOOOOOO|//
Harald Koenig, \/\/\/\/\/\/\/\/\/
Inst.f.Theoret.Astrophysik // / \\ \
koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Tue Mar 07 2000 - 21:00:19 EST