Date: Wed, 01 Mar 2006 12:17:16 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@deepcore.dk> To: Derek Ragona <derek@computinginnovations.com> Cc: sos@FreeBSD.ORG, "Mikhail T." <mi@aldan.algebra.com>, current@FreeBSD.ORG Subject: Re: pitiful performance of an SATA150 drive Message-ID: <440582BC.30407@deepcore.dk> In-Reply-To: <6.0.0.22.2.20060301045410.02659620@mail.computinginnovations.com> References: <200603010505.k2155HfQ003205@aldan.algebra.com> <6.0.0.22.2.20060301045410.02659620@mail.computinginnovations.com>
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Derek Ragona wrote: > The 500 GB drives I have seen are SATA300, backward compatible to > SATA150. If your's is SATA300, you might consider replacing the > controller with an add-on SATA300 controller. That would make no difference whatsoever, todays drives are not even close to maxing out the SATA150 interface speed. > You didn't say what brand or model your drive is. Different models come > with different sizes caches on the drives which effects performance. > Also depending on the drive read or write caching may or may NOT be > enabled. Usually the drive manufacturer has a utility to examine and > set these values. Caches are always turned on pr default in FreeBSD (if they exist), so nothing to get here *unless* write cache is turned of in the loader. >> 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'). The problem is the blocksize that gets in the way of utilizing full transfer speed. As I told the originator earlier in private mail one could use dd with a blocksize of 1Mbyte to test the actual max transfer speed to/from the drive. -Søren
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