Date: Fri, 15 Oct 2004 14:16:11 -0400 From: Kenneth Culver <culverk@sweetdreamsracing.biz> To: fandino@ng.fadesa.es Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD and poor ata performance Message-ID: <20041015141611.t8cgso00co4wggoc@www.sweetdreamsracing.biz> In-Reply-To: <41700BBB.50003@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>
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Quoting fandino <fandino@ng.fadesa.es>: > Kenneth Culver wrote: >>> well, my usage pattern is write a big file and few seconds later >>> read it. So my tests >>> were valid for the use of the computer. >>> >>> But you have reason, I must provide a more formal report. I redid all test >>> with bonnie++ and results shows Linux (56848 K/sec) two times faster than >>> FreeBSD (26347 K/sec) >>> >>> Any help will be appreciated! >>> >>> >>> Linux test (slackware 8.1, kernel 2.4.18, ext2 filesystem): >> >> >> This test isn't really a fair test either. The ext2 filesystem uses >> async io, >> and doesn't do any kind of journaling to ensure data integrity in >> the event of >> a crash. FreeBSD isn't using async, it uses softupdates. Because of this >> FreeBSD SHOULD be slower... but it'll be a lot more reliable than >> linux in the >> event of a power outage for example. The ext2 filesystem is extremely >> unreliable, and will almost always lose data when there's a crash or power >> outage. > > 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. Ken
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