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SubjectRe: Poor SCSI drive performance on SMP machine, 2.2.16

Hi.

Do you get messages like the ones below in /var/log/messages?

sym53c875-0-<0,0>: QUEUE FULL! 8 busy, 7 disconnected CCBs
sym53c875-0-<0,0>: tagged command queue depth set to 7

In fact, do you get any messages in your log files that look like they
might be related?

--
Bruce Harada
bruce@ask.ne.jp


On Sun, 28 Jan 2001 02:26:32 -0500
"paradox3" <paradox3@maine.rr.com> wrote:

> I have an SMP machine (dual PII 400s) running 2.2.16 with one 10,000 RPM
> IBM
> 10 GB SCSI drive
> (AIC 7890 on motherboard, using aic7xxx.o), and four various IDE drives.
> The
> SCSI drive
> performs the worst. In tests of writing 100 MB and sync'ing, one of my
> IDE
> drives takes 31 seconds. The SCSI drive (while doing nothing else) took
> 2 minutes, 10 seconds. This is extremely noticable in file transfers
> that
> completely
> monopolize the SCSI drive, and are much slower than when involving the
> IDE
> drives.
> After a large data operation on the SCSI drive, the system will hang for
> several minutes.
> Anyone know what could be causing this? Thanks.
>
> Attached are some data to help.
>
>
> Thanks,
> Para-dox (paradox3@maine.rr.com)
>
>
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