Subject: Re: slowdown with MI scsi on pmax (ds5000/200)
To: None <email@example.com>
From: Andrey Petrov <firstname.lastname@example.org>
Date: 05/21/2001 12:43:31
On Mon, May 21, 2001 at 05:30:11PM -0000, email@example.com wrote:
> Let's see... TQ went in 2000/11/30. I removed a bunch of DELAY()s
> on 2000/12/20. Those are before the problem began.
> FAS support went in 2001/03/29. thorpej_scsipi went in 2001/04/25.
> I suppose the cause is probably one or the other of those.
> Can you try a pre-thorpej_scsipi kernel and see if it still has
> the problem?
I tried 15t+fas and almost current and there are no difference here,
so it seems that fas changes are the cause. I also noticed significant
difference between read and write performances,
dd if=/dev/zero of=/dev/rsd0h bs=64k count=8000
gave me 135 secs, while
dd if=/dev/rsd0h of=/dev/null bs=64k count=8000