Date: Tue, 12 Mar 2002 15:21:28 -0700 From: "Justin T. Gibbs" <gibbs@scsiguy.com> To: Eric Dantan Rzewnicki <rzewnickie@rfa.org> Cc: aic7xxx@FreeBSD.ORG Subject: Re: performance issues: linux aic7xxx, 29160, Radion IFT-7200 Message-ID: <200203122221.g2CMLSI34053@aslan.scsiguy.com> In-Reply-To: Your message of "Tue, 12 Mar 2002 16:11:47 EST." <3C8E6F13.979EB689@rfa.org>
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>Hello again, > >Adjusting the tagged command queuing value hasn't improved performance >as measured with hdparm -t. > >Working with the 2.4.18 kernel, aic7xxx version 6.2.5 and queue depths >ranging from 0-32 I have consistently gotten results in the range of >13-16 MB/s using hdparm -t. With the old 5.2.4 driver hdparm -t gives >results of 47 MB/s. I wonder if for some reason we have disconnection disabled? I get much better performance than that talking to a plain old 10K RPM disk. Can you go into aic7xxx.c, search for ahc->user_discenable and print out the contents of that variable? Both drivers negotiate to the same values? >Is there something else I can do to try to get better performance with >the new driver? If I understood why the performance was bad, I'd tell you. 8-) Any chance you can rent a SCSI bus analyzer for a day and capture some traces? >You made a distinction between sequential and non-sequential workloads. If you have multple mp3's being written or read from at the same time, this will be a non-sequential workload. If you are only doing one at a time, it will be a sequential workload. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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