Date: Thu, 14 Aug 1997 08:52:54 -0500 (CDT) From: Guy Helmer <ghelmer@cs.iastate.edu> To: Paul Dekkers <psd@worldaccess.nl> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: FreeBSD is slower than Linux !? Message-ID: <Pine.HPP.3.96.970814084638.28465A-100000@popeye.cs.iastate.edu> In-Reply-To: <Pine.LNX.3.96.970814003604.104A-100000@gromit.nev.ml.org>
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On Thu, 14 Aug 1997, Paul Dekkers wrote: > I did some speed tests and I'd like to hear some reaction about this. > > Linux FreeBSD > dd 2.61 4.95 dd if=/dev/zero of=/test bs=1024 count=5000 > gzip 12.50 11.01 gzip -9 test > gunzip 3.86 8.12 > sync 4.21 0.9 -> So it seems FreeBSD writes everything to > disk directly?! WHY? This makes FreeBSD > much slower! This begs the question as to whether you repeated these tests several times; "update" may have sync'ed the disks during the gunzip, for example... > unzips 4.45 41.92 decompress the sendmail distr > compil 353.79 371.87 compile sendmail (makesendmail) As others have stated, this is likely due to the synchronous metadata updates that are the default behavior in FreeBSD. One pays for the security of ordered, committed writes to inodes and directories with a loss of speed... Guy Helmer, Computer Science Graduate Student - ghelmer@cs.iastate.edu Iowa State University http://www.cs.iastate.edu/~ghelmer Research Assistant, Scalable Computing Laboratory, Ames Laboratory
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