At Wed, 19 Dec 2001 15:16:36 -0500,
Jean-Francois Levesque <jfl@jfworld.net> wrote:
> I have a problem regarding my new Asus A7V266 board with VIA KT266 chipset. Byron Stanoszek told me to ask my problem to this list so here it is :
>
> My hard drive is a Maxtor 5T030H3 ATA DISK drive (30 gig). The problem is that I'm not able to read more than 7 MB/sec :
>
> [root@xyz jfl]# /sbin/hdparm -t /dev/hda
>
> /dev/hda:
> Timing buffered disk reads: 64 MB in 9.18 seconds = 6.97 MB/sec
>
>
> [root@xyz jfl]# /sbin/hdparm -d1 -X66 /dev/hda
>
> /dev/hda:
> setting using_dma to 1 (on)
> setting xfermode to 66 (UltraDMA mode2)
> using_dma = 1 (on)
> [root@xyz jfl]# /sbin/hdparm -t /dev/hda
>
> /dev/hda:
> Timing buffered disk reads: 64 MB in 9.70 seconds = 6.60 MB/sec
>
> [root@xyz jfl]# /sbin/hdparm /dev/hda
>
> /dev/hda:
> multcount = 16 (on)
> I/O support = 1 (32-bit)
> unmaskirq = 1 (on)
> using_dma = 0 (off)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 3736/255/63, sectors = 60030432, start = 0
> [root@xyz jfl]#
>
> I also have some idebus errors.
>
> The problem seems to be the DMA (ATA100 compatible board and disk).
BIOS parameter of your machine is set as "DISK auto detection" ? If
you so, would you try to change your BIOS setting as "this disk have
ultra DMA mode 4 (or 5, if your disk is ATA100)" explicitly ?
These behavior is very similar to my enviroment.
I have Asus KT133A board, and I had this problem, but I changed BIOS
setting, all problems were gone and became happy.
If my suggestion is totally wrong, I apologize...
(However, if my suggestion is relevant, then what's the problem?
IDE driver, or hardware problem?)
> PS: My disk also "freeze" my system for a few seconds (from 1/2 to maybe 3sec) while checking some data.
IMHO, the reason is that writing disk with PIO mode 4 (IIRC, 6.60MB/s
is corresponding with PIO mode 4) invites CPU occupation.
Andrew Morton also fixed 'low latency read problem', which is already
resolved the latest 2.4.17-rc2.
-- gotom
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This archive was generated by hypermail 2b29 : Sun Dec 23 2001 - 21:00:20 EST