Re: Poor SCSI drive performance on SMP machine, 2.2.16

["paradox3" <paradox3@maine.rr.com>]

I did this:

date
dd if=/dev/zero of=TESTFILE bs=1024 count=102400
date
sync
date


and I gave the time differences from the first to the last timestamp.

Regards, Para-dox (paradox3@maine.rr.com)



----- Original Message -----
From: "Bruce Harada" <bruce@ask.ne.jp>
To: "paradox3" <paradox3@maine.rr.com>
Cc: <linux-kernel@vger.kernel.org>
Sent: Sunday, January 28, 2001 2:31 PM
Subject: Re: Poor SCSI drive performance on SMP machine, 2.2.16


>
> Hm. As a point of comparison, I use a similar system to yours (full SCSI,
> though, no IDE) and I can copy a 100MB file from disk-to-disk, or on the
> same disk, in around 13 seconds. Where are you copying to the SCSI drive
> from - the same drive, an IDE disk, CDROM? If IDE, what are its
> particulars? (Check with hdparm -iI /dev/hd?)
>
> --
> Bruce Harada
> bruce@ask.ne.jp
>
>
>
> On Sun, 28 Jan 2001 12:44:29 -0500
> "paradox3" <paradox3@maine.rr.com> wrote:
> >
> > I don't get any messages relating to the drives in any syslog output.
> >
> > >
> > > 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?
> > >
> -
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