Date: Tue, 29 May 2007 06:00:18 +0000 From: Huang wen hui <huang@gddsn.org.cn> Cc: current@freebsd.org Subject: Re: zfs generate a lot of IO ? Message-ID: <465BC172.7030608@gddsn.org.cn> In-Reply-To: <20070528231455.GB14746@eschew.pusen.org> References: <46595D43.2090102@gddsn.org.cn> <20070528231455.GB14746@eschew.pusen.org>
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Ståle Kristoffersen 写道: > On 2007-05-27 at 10:28, Huang wen hui wrote: > >> hi, >> I install CURRENT with zfs root fs on my notebook(T60P). GENERIC >> configuration >> without INVARIANTS and WITNESS. >> I run a program to test. This program basically read a few small files >> and calcuate and output a small file. >> On FreeBSD6.2, iostat show that It generate a few io operation. >> But on zfs, generate a lot: >> > > <snip> > > This could be the same thing Nick Gustas and I have been seeing. Try > setting vfs.zfs.prefetch_disable="1" in loader.conf, this made things > "normal" for me. > > no, I already set this. #sysctl vfs.zfs.prefetch_disable vfs.zfs.prefetch_disable: 1
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