Disappointing speed with ZFS

[Niki Denev]

On Feb 11, 2008 7:05 PM, Alexey Tarasov <me at 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