Date: Wed, 01 Mar 2006 11:03:05 -0800 From: Julian Elischer <julian@elischer.org> To: Brian Candler <B.Candler@pobox.com> Cc: sos@freebsd.org, "Mikhail T." <mi@aldan.algebra.com>, current@freebsd.org Subject: Re: pitiful performance of an SATA150 drive Message-ID: <4405EFE9.6030807@elischer.org> In-Reply-To: <20060301144124.GA14411@uk.tiscali.com> References: <200603010505.k2155HfQ003205@aldan.algebra.com> <20060301144124.GA14411@uk.tiscali.com>
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Brian Candler wrote: >On Wed, Mar 01, 2006 at 12:05:17AM -0500, Mikhail T. wrote: > > >>I installed a new 500Gb SATA drive into my 6.1 system and am greatly >>disappointed with its performance. Although straight reading is >>Ok at around 32Mb/s, the writing is never more than 7Mb/s (as reported >>by `systat 1 -vm' while running `cat < /dev/zero > /dev/ad8'). >> >>I reported this a few months ago (running 6.0 then), and one of the >>suggestions was, the drive is bad. Well, I'm seeing the same with its >>replacement... >> >>Also, KNOPPIX-4.0.2 can write to the drive at 22Mb/s (using dd). >> >> I believe that linux uses bufferring in their 'raw' disks so that you may be actually doing larger reads and writes than you know.. (of course my knowledge of Linux is a bit old so they may have changed that) > >Just to be clear: this is Knoppix running on the *same* machine as you've >been testing FreeBSD? (In other words, you've not unplugged the drive and >plugged it into a different PC or controller?) > >Aside: why are you using cat under FreeBSD, but dd under Knoppix? I'd use dd >everywhere for consistency. > >Regards, > >Brian. >_______________________________________________ >freebsd-current@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-current >To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >
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