Date: Sat, 16 Oct 2004 17:22:29 +0200 From: fandino <fandino@ng.fadesa.es> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD and poor ata performance Message-ID: <41713CB5.3010109@ng.fadesa.es> In-Reply-To: <20041015141611.t8cgso00co4wggoc@www.sweetdreamsracing.biz> 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>
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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)
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