Date: Wed, 19 Nov 2008 03:25:15 -0600 (CST) From: Larry Rosenman <ler@lerctr.org> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: Nikolay Denev <ndenev@gmail.com>, freebsd-current@freebsd.org Subject: Re: HEADS UP: New ZFS in the tree. Message-ID: <alpine.BSF.2.00.0811190323110.59299@borg> In-Reply-To: <20081119090307.GA81236@icarus.home.lan> References: <20081117205526.GC1733@garage.freebsd.pl> <8ECD400F-BFE3-4E31-94F0-39AF5F44FDAC@gmail.com> <20081119090307.GA81236@icarus.home.lan>
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On Wed, 19 Nov 2008, Jeremy Chadwick wrote: > > Since this is CURRENT, you should be able to increase the kmem_size > and kmem_size_max entries to something larger than 1536M, especially > since the box has 4GB of RAM. (You shouldn't do this on RELENG_7). > > You might also consider disabling prefetch; there are reports of > peoples' boxes locking up hard (requiring a hard reset) when prefetch > is enabled. Others (like myself) just see "better overall system > responsiveness" when prefetch is disabled. Just as a note, with a -CURRENT from shortly after the ZFS upgrade, the vm.kmem* tuneables, without ANY override on my 4G amd64 box: vm.kmem_size_scale: 3 vm.kmem_size_max: 4509713203 vm.kmem_size_min: 0 vm.kmem_size: 1381195776 this is with a 2T zfs array, if that matters. -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 512-248-2683 E-Mail: ler@lerctr.org US Mail: 430 Valona Loop, Round Rock, TX 78681-3893
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