Date: Thu, 30 Apr 1998 10:07:44 -0700 (PDT) From: Tom <tom@sdf.com> To: Raul Zighelboim <rzig@verio.net> Cc: "'scsi@freebsd.org'" <scsi@FreeBSD.ORG>, "'n@nectar.com'" <n@nectar.com> Subject: RE: DPT driver performance Message-ID: <Pine.BSF.3.95q.980430100330.4191A-100000@misery.sdf.com> In-Reply-To: <A03CD00C69B1D01195AB00A024ECEB1684CB26@kaori.communique.net>
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On Thu, 30 Apr 1998, Raul Zighelboim wrote: > I am running ONE drive on an AHC controller and ONE drive on a DPT > controller. No stripping, no raid. Just one drive. Both are formated > with 512b/s. > > No, I do not intend to run iozone as my main application. But it > bothers me that under the same conditions, the Adaptec controller can > write a large file twice as fast. > > You're saying that this is not relevant ? That is exactly what I'm saying. Besides, as I recall the results, they weren't twice as fast. By default, the DPT controler has a half-second flush delay. Change this to zero to optimze for iozone. Or you could just disable write-caching altogether, as iozone does not benefit from it. > ================================================== > Raul Zighelboim rzig@verio.net Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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