Date: Wed, 16 Jan 2008 13:48:12 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Atom Smasher <atom@smasher.org> Cc: freebsd-hackers@freebsd.org Subject: Re: disk throughput Message-ID: <20080116124812.GR79270@cicely12.cicely.de> In-Reply-To: <20080116094829.55748.qmail@smasher.org> References: <20080116094829.55748.qmail@smasher.org>
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On Wed, Jan 16, 2008 at 10:48:27PM +1300, Atom Smasher wrote: > i've got this running in one term: > systat -iostat 1 > and this in another term: > dd if=/dev/acd0 bs=2048 count=123456 | md5 > > apparently the system only knows about throughput of mounted disks? It doesn't seem to know about ata CD drives, SCSI CD drives work fine. Use gstat, which retrieves statistics at a different layer. You should use a multiple of 2k (e.g. 64k) for blocksize though. Just using 2k is likely to be much slower. > is that a bug or a feature? I would say it's a missing feature in acd driver. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de
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