Date: Mon, 11 Feb 2008 23:37:27 +0200 From: "Niki Denev" <nike_d@cytexbg.com> To: "Alexey Tarasov" <me@lexasoft.ru> Cc: current@freebsd.org Subject: Re: Disappointing speed with ZFS Message-ID: <2e77fc10802111337j45915422v42c098a1574406fb@mail.gmail.com> In-Reply-To: <50186FCD-F67F-4144-BDF1-FB9A7F9AAB64@lexasoft.ru> References: <9DA6FFCD-11DB-4580-9314-52B0885351D8@lexasoft.ru> <fopmlp$qeh$1@ger.gmane.org> <50186FCD-F67F-4144-BDF1-FB9A7F9AAB64@lexasoft.ru>
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On Feb 11, 2008 7:05 PM, Alexey Tarasov <me@lexasoft.ru> wrote: > I've done similar tests on the other machine, and all looks fine. > > But why on this machine ZFS works slower than UFS? When I make UFS > file system on the same disk, rtorrent hashing works 10 times faster. > And while hashing, HDD is used three times intensively with ZFS > (noticed by flashing LED). > > I have an amd64 Core2Duo processor, 4 Gb of RAM, what is not enough > for ZFS? > > What kernel tuning can help me? > > What happens when you disable ZFS prefetching by putting : vfs.zfs.prefetch_disable=1 in your /boot/loader.conf? --Niki
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