[gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda

[gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda

[Mivz]

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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Re: [gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda

[Greg KH]

On Wed, Jun 07, 2006 at 10:07:07PM +0200, Mivz wrote:
> 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?

You didn't tell us which sata drivers you were using, nor what kernel
version.

Either way, try asking this on the linux-kernel or linux-ide mailing
lists, gentoo-dev isn't the right place for it.

good luck,

greg k-h
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gentoo-dev@gentoo.org mailing list

Re: [gentoo-dev] SATA disk slower as /dev/sda then as in /dev/hda

[Daniel Drake]

Mivz wrote:
> /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.
> 

The unbuffered speed is identical, the cached read is the only 
difference. Cached reads are not a test of hard disk performance, this 
is a mostly useless benchmark (note that on that metric, your cdrom 
drive performs at the same speed as your hard disk...)

Daniel
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