Date: Mon, 18 Oct 2004 10:00:45 -0400 From: Kenneth Culver <culverk@sweetdreamsracing.biz> To: fandino@ng.fadesa.es Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <20041018100045.f8koww0skcco0woo@www.sweetdreamsracing.biz> In-Reply-To: <41715E7F.7060509@ng.fadesa.es> References: <20041015190638.C5A0E5D04@ptavv.es.net> <41715E7F.7060509@ng.fadesa.es>
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Quoting fandino <fandino@ng.fadesa.es>: > Hello Kevin, > > Kevin Oberman wrote: >>> 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. > > write-cache was enable on all tests and disks were in UDMA5 mode. > > In this new round of tests I add FreeBSD witch async and OpenBSD (always > using the same hardware). FreeBSD is by far, the worst throughput of all > (about 50% slower than others) :-? > > GNU/Linux 2.4.18 with ext2: 56848 K/sec > FreeBSD 5.3b7 with default fs: 26347 K/sec > FreeBSD 5.3b7 with default fs(async): 26566 K/sec > FreeBSD 5.3b7 ata raid0* (two disks): 26131 K/sec > FreeBSD 5.3b7 geom stripe* (two disks): 30063 K/sec > FreeBSD 5.3b7 geom stripe** (four disks): 31891 K/sec > OpenBSD 3.5 UFS fs: 55277 K/sec > > * Each disk of the raid had a throughput of approx. 15000 K/sec > ** Each disk of the raid had a throughput of approx. 7500 K/sec > Each disk of the read split the throughput by half. > > How is possible that FreeBSD performs as bad? > > If you're still using the GENERIC kernel, that could explain it, and judging from other emails I've seen from you, you're still using the GENERIC kernel. Ken
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