Hello,
I have a Intel SATA controler in my laptop and it is adressed as
/dev/sda. My cdrom is /dev/hdc.
My cdrom drive I can configure with hdparm to use dma and 32-bit io and
it has a nice speed:
/dev/hdc:
Timing cached reads: 1408 MB in 2.00 seconds = 702.55 MB/sec
Timing buffered disk reads: 4 MB in 5.56 seconds = 736.64 kB/sec
I can not use hdparm to configure /dev/sda, also sdparm can not set
anything:
sdparm --set UDMA6=1 /dev/sg0
/dev/sg0: ATA HTS726060M9AT00 MH4O
change_mode_page: failed setting page: SAT pATA control
This happens with all options, also awre, arre and wce. The speed of
this disk:
/dev/sda:
Timing cached reads: 1424 MB in 2.00 seconds = 711.96 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Timing buffered disk reads: 114 MB in 3.00 seconds = 37.95 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
Now I tryed a old Gentoo 1.4-rc1 livecd, cause this one loads the disk
still as /dev/hda and not sda.
After enabling dma, 32bit io and udma: hdparm -X66 -c1 -d1
It had a speed of 2560.00 MB/sec bufferd
and 37,65 unbufferd.
It was almost 4 times as fast.
Why is it that when I use the new kernel SATA drivers and load is as
/dev/sda it is slower as with the old IDE drivers?
Mivz
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