Date: Fri, 12 Feb 1999 08:11:40 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> 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 Message-ID: <Pine.LNX.4.04.9902120811340.17711-100000@feral-gw> In-Reply-To: <199902121610.JAA34695@panzer.plutotech.com>
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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 > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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