Date: Tue, 26 Oct 2004 18:07:15 +0200 From: fandino <fandino@ng.fadesa.es> Cc: freebsd-current@freebsd.org Subject: Re: FreeBSD 5.3b7and poor ata performance Message-ID: <417E7633.8090507@ng.fadesa.es> In-Reply-To: <417D65F1.2040809@freebsd.org> References: <14479.1098695558@critter.freebsd.dk> <417D25E8.6080804@ng.fadesa.es> <200410251928.01536.victor@alf.dyndns.ws> <200410251837.58257.Thomas.Sparrevohn@btinternet.com> <417D3F12.20302@DeepCore.dk> <417D40A1.9030802@ng.fadesa.es> <417D45F1.9090504@freebsd.org> <77F3FD4D-26BE-11D9-9A2F-003065ABFD92@mac.com> <417D58B6.5030509@freebsd.org> <F5F15CA0-26C5-11D9-9A2F-003065ABFD92@mac.com> <417D65F1.2040809@freebsd.org>
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Scott Long wrote: > RAID-0 yes, RAID-10 no, at least not for software RAID. The machine > winds up having to transfer the same data twice across the PCI bus, > twice through the controller, etc. If the controller is on a simple > PCI-32/33 bus then it will quickly become saturated. When I tested gstripe throughput it was very bad and it makes me think in my PC hitting some limit and my thoughts was some type of limit in the OS, it was my _particular_ case. Of course, you comments about RAID are right, but do you think a RAID0 with two disks is reaching the PCI limit?
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