Date: Tue, 04 Oct 2011 15:10:40 +1100 From: Aristedes Maniatis <ari@ish.com.au> To: freebsd-fs@freebsd.org Subject: vm.kmem_size_scale recommendation for ZFS Message-ID: <4E8A8740.100@ish.com.au>
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Having just suffered from a FreeBSD 8.2 machine hit with the "kmem_map too small" error [1], what is the current recommendation for a machine running RELEASE-8.2? A. vm.kmem_size_scale=1 (this is the new default in 8-STABLE but 8.2-RELEASE had it set to 3) B. vm.kmem_size_scale=0.66 (this is aligned with Pawel's recommendation of setting vm.kmem_size to 150% of your RAM. [2] C. Leaving vm.kmem_size_scale alone and manually setting vm.kmem_size directly as Pawel is doing Thanks Ari Maniatis [1] http://freebsd.1045724.n5.nabble.com/kmem-map-too-small-with-ZFS-and-8-2-RELEASE-td4029979.html [2] http://blogs.freebsdish.org/pjd/2010/08/06/from-sysinstall-to-zfs-only-configuration -- --------------------------> Aristedes Maniatis ish http://www.ish.com.au Level 1, 30 Wilson Street Newtown 2042 Australia phone +61 2 9550 5001 fax +61 2 9550 4001 GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
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