Date: Tue, 24 Aug 1999 03:05:45 -0700 From: David Greenman <dg@root.com> To: "liudong" <shift@263.net> Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: The I/O is too slow than linux Message-ID: <199908241005.DAA14184@implode.root.com> In-Reply-To: Your message of "Tue, 24 Aug 1999 02:27:44 CDT." <199908240727.CAA14695@db.geocrawler.com>
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>then run ... ># time dd if=/dev/da0 of=/dev/null count=200000 >200000+0 records in >200000+0 records out >102400000 bytes transferred in 36.852771 secs (2778624 bytes/sec) > >real 0m36.911s >user 0m0.372s >sys 0m5.982s You need to use the raw device for tests like this and you should specify a blocksize as well, e.g.: time dd if/dev/rda0 of=/dev/null bs=64k count=200000 The block device should only be used when mounting the filesystem. -DG David Greenman Co-founder/Principal Architect, The FreeBSD Project - http://www.freebsd.org Creator of high-performance Internet servers - http://www.terasolutions.com Pave the road of life with opportunities. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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