Date: Sun, 17 Oct 2004 17:00:02 +0200 From: fandino <fandino@ng.fadesa.es> Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD and poor ata performance Message-ID: <417288F2.9090502@ng.fadesa.es> In-Reply-To: <41713CB5.3010109@ng.fadesa.es> References: <416EB6B1.6060405@ng.fadesa.es> <416F849F.8020508@solid-state-logic.com> <416F90E6.10108@ng.fadesa.es> <200410151223.33355.howells@kde.org> <416FF477.4010408@ng.fadesa.es> <20041015131432.srwo0wog000skgcs@www.sweetdreamsracing.biz> <41700BBB.50003@ng.fadesa.es> <20041015141611.t8cgso00co4wggoc@www.sweetdreamsracing.biz> <41713CB5.3010109@ng.fadesa.es>
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> Kenneth Culver wrote: > >>> but then why does read/write tests over raw devices performs so bad? >>> AFAIK on raw devices not filesystem, journaling, caches, etc are >>> involved. >>> _______________________________________________ >> >> >> >> Like I said before, you might not have been testing the throughput of >> the disks, >> instead you may have been testing the throughput of /dev/zero. > > > I woluld like to have the throughput of /dev/zero on my disks. :-) > > > # dd if=/dev/zero of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 3.414659 secs (314450672 bytes/sec) I'm redirecting this thread to current@ because something seems broken. 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 raid split the throughput by half. http://lists.freebsd.org/pipermail/freebsd-current/2004-October/040567.html
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