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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!spool.mu.edu!newspump.sol.net!ddsw1!news.mcs.net!www.nntp.primenet.com!nntp.primenet.com!enews.sgi.com!super.zippo.com!zdc!szdc!szdc-e!news From: "John S. Dyson" <dyson@indy.celebration.net> Newsgroups: comp.os.linux.development.system,comp.unix.bsd.freebsd.misc Subject: Re: Linux vs FreeBSD disk io performance Date: Thu, 17 Oct 1996 11:32:26 -0700 Organization: AT&T Lines: 23 Message-ID: <32667BBA.12A8@indy.celebration.net> References: <86g23ey1uc.fsf@romulus.ihosteng.priv.no> <545di1$tvd@halon.vggas.com> Reply-To: dyson@indy.celebration.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0 (WinNT; I) Xref: euryale.cc.adfa.oz.au comp.os.linux.development.system:33656 comp.unix.bsd.freebsd.misc:29465 James Youngman wrote: > > In article <86g23ey1uc.fsf@romulus.ihosteng.priv.no>, > ivarh@romulus.ihosteng.priv.no says... > > > >To see this you who have both operating systems installed can start > >the command: dd if=/dev/<root partition> of=/dev/null bs=409600& > >4 times a minute apart. After doing this try the df command or a ls -l > >on both systems. On the FreeBSD system I barly notice that something > >is going on. The linux systems feals realy clumsy. This is on the same > >machine. > > > >Can someone explain this different behaviour? > > Under linux, df does a sync(). > Try GNU df or ls under FreeBSD to see if there is a difference. FreeBSD does not accumulate nearly as many dirty blocks as Linux, and so will probably behave better even using the GNU tools. John dyson@freebsd.org