Date: Mon, 25 Oct 1999 10:58:47 +0100 From: Geoff Buckingham <geoffb@chuggalug.clues.com> To: Michael Sinz <Michael.Sinz@sinz.org> Cc: Gerard Roudier <groudier@club-internet.fr>, Mike Sinz <Michael@sinz.org>, Randell Jesup <rjesup@wgate.com>, "scsi@FreeBSD.ORG" <scsi@FreeBSD.ORG> Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 Message-ID: <19991025105847.A91296@chuggalug.clues.com> In-Reply-To: <199910201401.KAA25925@vixen.sinz.org>; from Michael Sinz on Wed, Oct 20, 1999 at 10:01:46AM -0400 References: <199910201401.KAA25925@vixen.sinz.org>
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On Wed, Oct 20, 1999 at 10:01:46AM -0400, Michael Sinz wrote: > > IMHO: > For a general purpose server, one must assume that the special case of > the I/O working out to be single threaded will not happen. Multiple things > will be going on and the working set will be larger than the cache size. > A bit of overhead added to the "simple" cases will make the general > operation better. Benchmarks, however, may well show this as slower > since some extra overhead had to be added. Benchmarks would need to > become much more complex in order to show the real benefit or lack of > benefit for any one technique. > Which brings us back to the question as to wether or not disabling TAGs for WDE * is the correct thing to do? IMHO it is not. -- GeoffB To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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