Date: Thu, 26 Sep 2002 08:35:23 -0500 (CDT) From: Sean Farley <sean-freebsd@farley.org> To: Mike Silbersack <silby@silby.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Slow I/O responsiveness with UDMA133 Message-ID: <20020926075207.U295-100000@thor.farley.org> In-Reply-To: <20020925223241.O5757-100000@patrocles.silby.com>
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On Wed, 25 Sep 2002 22:34, Mike Silbersack wrote: > > On Wed, 25 Sep 2002, Sean Farley wrote: > > > With write cache enabled it does perform better, but I would like > > the new computer to at least equal the old system without it > > enabled. > > With all due respect, whether that's a reality isn't your choice, it's > the drive's choice. :) I am sorry, but I do not give my computer components freedom of choice. :) I just do not understand how a 5400 RPM UDMA 33 drive can beat a 7200 RPM UDMA 133 drive by 33% on sequential output blocks. > Does the drive support tagged queueing? That should give you the > benefits of write caching with a little bit more safety. I thought only IBM had IDE drives which supported tags. No. The specs do not mention tags. Another question, I see that in the archives that enabling IDE Prefetch was not good. Has this changed? I currently have it turned off in the BIOS. Hmm, I see that S=F8ren mentions it should be kept on: http://groups.google.com/groups?hl=3Den&lr=3Dlang_en&ie=3DUTF-8&selm=3D2002= 01091654.g09GsG703561_freebsd.dk%40ns.sol.net OTOH, he says that the ATA driver automatically turns it on. BTW, would there happen to be a preferred BIOS setup page for FreeBSD? I have already scanned through the docs. Sean ----------------------- sean-freebsd@farley.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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