lkml.org 
[lkml]   [2005]   [Apr]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjectpoor SATA performance under 2.6.11 (with < 2.6.11 is OK)?
I have a Silicon Image SIL3112A SATA PCI controller + 2x 200GB, 8MB
Barracuda drives.

The performance under 2.6 kernels is *very* poor (Timing buffered disk
reads never more than 20 MB/sec); under 2.4 it runs quite fine (Timing
buffered disk reads around 60 MB/sec).



Below three hdparm reads on three different liveCDs (kernels 2.6.11.6,
2.4.28, 2.6.11).


Kernel 2.6.11.6, Slax 5.0.1

root@slax:~# hdparm -Tt /dev/sda /dev/sdb

/dev/sda:
Timing cached reads: 1124 MB in 2.00 seconds = 560.68 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 60 MB in 3.10 seconds = 19.38 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device

/dev/sdb:
Timing cached reads: 1128 MB in 2.00 seconds = 563.80 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 60 MB in 3.09 seconds = 19.39 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device


Kernel 2.4.28, Slax 4.1.4

root@slax:~# hdparm -Tt /dev/sda /dev/sdb

/dev/sda:
Timing buffer-cache reads: 1152 MB in 2.00 seconds = 576.00 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not
supported
Timing buffered disk reads: 180 MB in 3.01 seconds = 59.80 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not
supported

/dev/sdb:
Timing buffer-cache reads: 1124 MB in 2.00 seconds = 562.00 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not
supported
Timing buffered disk reads: 180 MB in 3.07 seconds = 58.63 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not
supported


Kernel 2.6.11, Knoppix 3.8.1:

# hdparm -Tt /dev/sda /dev/sdb

/dev/sda:
Timing cached reads: 1188 MB in 2.00 seconds = 592.61 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 50 MB in 3.09 seconds = 16.19 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device

/dev/sdb:
Timing cached reads: 1176 MB in 2.00 seconds = 586.92 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 54 MB in 3.19 seconds = 16.94 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device



I tested it also with Mandrake 10.2 (it is shipped with 2.6.11 kernel):
Timing cached reads was about 100 MB/sec and Timing buffered disk
reads was about 10 MB/sec.

Another test on Mandrake with 2.6.8.1 kernel - it's the fastest of all
test:

# hdparm -Tt /dev/sda

/dev/sda:
Timing cached reads: 1064 MB in 2.00 seconds = 531.81 MB/sec
BLKFLSBUF failed: Operation not supported
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not
supported
Timing buffered disk reads: 310 MB in 3.02 seconds = 102.49 MB/sec


So on three distros with 2.6.11.x kernels (Knoppix, Slax, Mandrake),
SATA performance was extremely bad for me.
Coincidence, or something SATA-related got borked in 2.6.11?


Tomek

-
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/

\
 
 \ /
  Last update: 2005-04-14 18:28    [W:0.071 / U:0.448 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site