Date: Mon, 9 Apr 2007 20:30:35 -0500 From: Craig Boston <craig@xfoil.gank.org> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-fs@FreeBSD.org, freebsd-current@FreeBSD.org, Pawel Jakub Dawidek <pjd@FreeBSD.org> Subject: Re: ZFS committed to the FreeBSD base. Message-ID: <20070410013034.GC8189@nowhere> In-Reply-To: <20070410011125.GB38535@xor.obsecurity.org> References: <20070407025644.GC8831@cicely12.cicely.de> <20070407131353.GE63916@garage.freebsd.pl> <4617A3A6.60804@kasimir.com> <20070407165759.GG8831@cicely12.cicely.de> <20070407180319.GH8831@cicely12.cicely.de> <20070407191517.GN63916@garage.freebsd.pl> <20070407212413.GK8831@cicely12.cicely.de> <20070410003505.GA8189@nowhere> <20070410003837.GB8189@nowhere> <20070410011125.GB38535@xor.obsecurity.org>
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On Mon, Apr 09, 2007 at 09:11:25PM -0400, Kris Kennaway wrote: > Nah, you were right the first time :) Your system is defaulting to > 160MB for the kmem_map, of which zfs will (by default) try to use up > to 3/4. Naturally this doesn't leave much for the rest of the kernel > (40MB), so you'll easily run the kernel out of memory. Hmm, I had already reduced the maximum arc size to 64MB though, which I figured (hoped?) would leave plenty of room. So if kmem_size is the total size and it can't grow, what is kmem_size_max? Is there a way to see a sum of total kmem allocation? Even the vm.zone breakdown seems to be gone in current so apparently my knowledge of such things is becoming obsolete :) > For now, you probably want to increase vm.kmem_size a bit to allow > some more room for zfs, and set vfs.zfs.arc_max and arc_min to > something more reasonable like 64*1024*1024+1 (the +1 is needed > because zfs currently requires "greater than 64MB" for the arc). Yeah, I found that out the hard way after wondering why it was ignoring the tunables :) I ran out of kmem_map space once with it set to 64*1024*1024+1, then I modified the source so that it would accept zfs_arc_max >= (64 << 20) instead, just in case it was a power-of-2 thing. Craig
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