From owner-freebsd-scsi  Fri Feb 12 08:11:54 1999
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	Fri, 12 Feb 1999 08:11:40 -0800
Date: Fri, 12 Feb 1999 08:11:40 -0800 (PST)
From: Matthew Jacob <mjacob@feral.com>
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To: "Kenneth D. Merry" <ken@plutotech.com>
cc: ANDREAS.KLEMM.AK@bayer-ag.de, scsi@FreeBSD.ORG
Subject: Re: It%s not the write cache on 3.0-STABLE and not tagged comma
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No, it *just* arrived....


On Fri, 12 Feb 1999, Kenneth D. Merry wrote:

> Matthew Jacob wrote...
> > 
> > Is read performance okay?
> > Also what's "poor"?
> 
> Read performance is fine. (about 12MB/sec)  "poor" means between 1 and
> 3MB/sec.
> 
> I'll forward you his original mail, I think it probably got nuked by
> Majordomo's message size filter.
> 
> > On Fri, 12 Feb 1999, Kenneth D. Merry wrote:
> > 
> > > Matthew Jacob wrote...
> > > > 
> > > > What was the problem?
> > > 
> > > He is getting poor performance for sequential writes with a Seagate disk
> > > under CAM.  Write throughput to the disk is fairly erratic.  (i.e., lots of
> > > ups and downs)
> > > 
> > > He has the problem under 2.2.7 with tagged queueing enabled, but not when
> > > he disables tagged queueing.  The problem occurs under 3.0 with or
> > > without tagged queueing.
> > > 
> > > I told him to disable write caching, since I have seen similar problems
> > > when write caching is enabled, but that didn't seem to fix the problem.
> > > 
> > > Any ideas?
> > > 
> > > Ken
> > > -- 
> > > Kenneth Merry
> > > ken@plutotech.com
> > > 
> 
> Ken
> -- 
> Kenneth Merry
> ken@plutotech.com
> 


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