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Date:      Fri, 12 Feb 1999 09:02:18 -0700 (MST)
From:      "Kenneth D. Merry" <ken@plutotech.com>
To:        mjacob@feral.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
Message-ID:  <199902121602.JAA34641@panzer.plutotech.com>
In-Reply-To: <Pine.LNX.4.04.9902120557340.17711-100000@feral-gw> from Matthew Jacob at "Feb 12, 1999  5:57:40 am"

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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

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