Hi,
I've asked this question in several Newsgroups but nobody was really
able to answer it. That's why I decided to send it to LKM. Please CC
me on your replies. Thanks!
I've got a question related to ide performance.
First of all my hardware:
Mainboard: ASUS P4PE (using onboard IDE but not S-ATA)
http://www.asus.com/products/mb/socket478/p4pe/overview.htm
Harddisk: Western Digital WD800JB
http://www.westerndigital.com/products/products.asp?DriveID=32
Now about the current performance (on 2.4.20 and almost the same on 2.5.56):
tom@storm:~$ sudo hdparm -tT /dev/hda
/dev/hda:
Timing buffer-cache reads: 128 MB in 0.27 seconds =474.07 MB/sec
Timing buffered disk reads: 64 MB in 3.05 seconds = 20.98 MB/sec
The cache read time is pretty ok but the disk read time is below of
what I'd have expected. My expectations would have been around 40MB/sec.
Am I wrong with my expectations for this setup?
I'd really be interested in any suggestion about how I could omptimize
the system.
And here's some more information about the current settings (let me
know if you need anything else):
tom@storm:~$ sudo hdparm /dev/hda
/dev/hda:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 255 (on)
geometry = 9729/255/63, sectors = 156301488, start = 0
busstate = 1 (on)
tom@storm:~$ sudo cat /proc/ide/hda/settings
name value min max mode
---- ----- --- --- ----
acoustic 0 0 254 rw
address 0 0 2 rw
bios_cyl 9729 0 65535 rw
bios_head 255 0 255 rw
bios_sect 63 0 63 rw
breada_readahead 255 0 255 rw
bswap 0 0 1 r
current_speed 69 0 69 rw
failures 0 0 65535 rw
file_readahead 16384 0 16384 rw
ide_scsi 0 0 1 rw
init_speed 69 0 69 rw
io_32bit 3 0 3 rw
keepsettings 0 0 1 rw
lun 0 0 7 rw
max_failures 1 0 65535 rw
max_kb_per_request 255 1 255 rw
multcount 16 0 16 rw
nice1 1 0 1 rw
nowerr 0 0 1 rw
number 0 0 3 rw
pio_mode write-only 0 255 w
slow 0 0 1 rw
unmaskirq 1 0 1 rw
using_dma 1 0 1 rw
wcache 0 0 1 rw
tom@storm:~$ sudo hdparm -I /dev/hda
/dev/hda:
non-removable ATA device, with non-removable media
Model Number: WDC WD800JB-00CRA1
Serial Number: WD-WMA8E3710419
Firmware Revision: 17.07W17
Standards:
Supported: 1 2 3 4 5
Likely used: 5
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
bytes/track: 57600 (obsolete)
bytes/sector: 600 (obsolete)
current sector capacity: 16514064
LBA user addressable sectors = 156301488
Capabilities:
LBA, IORDY(can be disabled)
Buffer size: 8192.0kB ECC bytes: 40 Queue depth: 1
Standby timer values: spec'd by standard, with device specific minimum
r/w multiple sector transfer: Max = 16 Current = 16
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* look-ahead
* write cache
* Power Management feature set
Security Mode feature set
SMART feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
Security:
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
Checksum: correct
A full dmesg dump can be found at http://www.wnk.at/files/dmesg.txt
Thanks very much,
-- Tom Winkler - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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