Date: Fri, 15 Oct 2004 12:06:38 -0700 From: "Kevin Oberman" <oberman@es.net> To: fandino@ng.fadesa.es Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <20041015190638.C5A0E5D04@ptavv.es.net> In-Reply-To: Your message of "Fri, 15 Oct 2004 20:06:12 %2B0200." <41701194.5010107@ng.fadesa.es>
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> Date: Fri, 15 Oct 2004 20:06:12 +0200 > From: fandino <fandino@ng.fadesa.es> > Sender: owner-freebsd-current@freebsd.org > > Hello, > > This is an interesting issue. While I was installing FreeBSD 5.3b7 > I wonder about the performance that the new branch will bring to my > computer, and it was a deception how bad FreeBSD performs compared > with Linux on the same hardware (even I repeat the test on different PC > with identical results). > > Tests were done win bonnie++ 1.93c and the results were Linux two > times faster than FreeBSD using the same hardware. > > GNU/Linux 2.4.18 with ext2: 56848 K/sec > FreeBSD 5.3b7 with default fs: 26347 K/sec > FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec > FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec Are you comparing apples with apples? I believe that Linux mounts file systems as async by default. To compare with FreeBSD, you should use "-o async" when you mount. Of course, this is less reliable. Also, make sure that disk write-cache is enabled on both or disabled on both. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634
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