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Date: Mon, 11 Feb 2008 23:37:27 +0200
From: "Niki Denev" <nike_d@cytexbg.com>
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To: "Alexey Tarasov" <me@lexasoft.ru>
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References: <9DA6FFCD-11DB-4580-9314-52B0885351D8@lexasoft.ru>
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Cc: current@freebsd.org
Subject: Re: Disappointing speed with ZFS
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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