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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