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
tests:
# 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
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