Date: Fri, 15 Aug 1997 03:31:23 -0700 From: David Greenman <dg@root.com> To: Paul Dekkers <psd@worldaccess.nl> Cc: "Jay D. Nelson" <jdn@qiv.com>, Shawn Ramsey <shawn@luke.cpl.net>, freebsd-questions@FreeBSD.ORG Subject: Re: FreeBSD is slower than Linux !? Message-ID: <199708151031.DAA14879@implode.root.com> In-Reply-To: Your message of "Thu, 14 Aug 1997 22:20:33 %2B0200." <Pine.LNX.3.96.970814221735.136B-100000@gromit.nev.ml.org>
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>>>> > Linux FreeBSD >>>> >dd 2.61 4.95 dd if=/dev/zero of=/test bs=1024 count=5000 The blocksize is critical to this benchmark. Try a larger blocksize: [implode:dg] time dd if=/dev/zero of=/foo bs=1024 count=5000 5000+0 records in 5000+0 records out 5120000 bytes transferred in 2 secs (2560000 bytes/sec) 0.015u 0.915s 0:01.34 68.6% 74+271k 1+86io 3pf+0w [implode:dg] time dd if=/dev/zero of=/foo bs=50k count=100 100+0 records in 100+0 records out 5120000 bytes transferred in 1 secs (5120000 bytes/sec) 0.000u 0.294s 0:00.51 56.8% 97+609k 0+85io 0pf+0w ...a much larger block size is nearly 3 times faster on a machine here. This particular benchmark isn't really all that useful in any case since it is sensitive to many different factors, not the least of which is the speed of /dev/zero, which has not been optimized much in FreeBSD. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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