Subject: Re: slowdown with MI scsi on pmax (ds5000/200)
To: None <tech-kern@netbsd.org>
From: Andrey Petrov <petrov@netbsd.org>
List: tech-kern
Date: 05/21/2001 13:06:00
On Mon, May 21, 2001 at 12:43:31PM -0700, Andrey Petrov wrote:
> On Mon, May 21, 2001 at 05:30:11PM -0000, eeh@netbsd.org 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
> 	69 secs.
> 

Spoke too soon, I got the same results with solaris as well, so
seems that's my hard drive puts these limits. That's strange anyway.

	Andrey