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SubjectRe: Poor SCSI drive performance on SMP machine, 2.2.16
Date
I don't get any messages relating to the drives in any syslog output.



----- Original Message -----
From: "Bruce Harada" <bruce@ask.ne.jp>
To: "paradox3" <paradox3@maine.rr.com>
Cc: <linux-kernel@vger.kernel.org>; <linux-smp@vger.kernel.org>
Sent: Sunday, January 28, 2001 3:40 AM
Subject: Re: 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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