Date: Thu, 31 Jul 2003 14:19:21 +0200 (CEST) From: Soeren Schmidt <sos@spider.deepcore.dk> To: Buckie <freebsd1@centrum.cz> Cc: freebsd-hackers@freebsd.org Subject: Re: Ultra ATA card doesn't seem to provide Ultra speeds. Message-ID: <200307311219.h6VCJLVG053962@spider.deepcore.dk> In-Reply-To: <1757258773.20030731145432@centrum.cz>
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It seems Buckie wrote: > I ran a dd: > dd if=/dev/ad1 of=/dev/zero ibs=8192 > ...and cancelled it after some amount of time: > 2321+0 records in > 37136+0 records out > 19013632 bytes transferred in 27.876118 secs (682076 bytes/sec) > > I don't use static2 ata device numbering hence Maxtor is assigned ad1, > but it would be ad4 if things were static. > > Experiemnting with ibs value I can get speeds of up to 16MB per > second. But no more. OH, you need to output to /dev/null NOT /dev/zero :) besides that, all looks OK, but you need a fairly large bs to se improvments on this (relatively slow) machine, try a bs of 1m and see if that helps, if not there is something slowing down your system.. -Søren
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