Date: Sun, 12 Oct 2008 14:22:04 +0200 From: Michel Talon <talon@lpthe.jussieu.fr> To: freebsd-hackers@freebsd.org Subject: Re: ZFS boot Message-ID: <20081012122204.GA85909@lpthe.jussieu.fr>
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> > It seems a bit much to reserve 1 G of memory solely for the use of the > > kernel, expecially in my case when that's all I have :) But on amd64, > > it's welcome to have terabytes of address space if it will help. > > ZFS is a memory hog, period. That's just the nature of the beast. > You probably should not be using it on a system with 1GB. I'll remind > you that memory right now is *incredibly* cheap; you can get 4GB of > brand-name lifetime-warranty RAM for around US$40-50. I am running FreeBSD-7 with the following: m.kmem_size="512M" vm.kmem_size_max="512M" vfs.zfs.arc_max="256M" vfs.zfs.arc_min="32M" vfs.zfs.prefetch_disable="1" on a i386 machine with 1 Gig memory (now upgraded to 1.5 Gig) and i have not experienced, up to now, any lockup problem. Apparently the kernel effectively uses around 500M memory, indeed. Performance seems reasonable to me, not worse than with UFS. -- Michel TALON
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