Date: Mon, 10 May 2010 19:09:41 +0100 From: Bruce Cran <bruce@cran.org.uk> To: freebsd-fs@freebsd.org Subject: vm.kmem_size and ZFS on 9-CURRENT Message-ID: <201005101909.41614.bruce@cran.org.uk>
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Hi, I recently converted my /home and /usr slices over to ZFS on my desktop running 9-CURRENT amd64 with 6GB RAM. In the process of copying data off /var to convert it too, I got the "kmem_map too small" panic, which led me to the thread at http://lists.freebsd.org/pipermail/freebsd- current/2010-April/016984.html which appears to conclude that the defaults even on -CURRENT aren't suitable and that vm.kmem_size needs tuned to be 2xRAM. Since I had followed the guide at http://wiki.freebsd.org/ZFSQuickStartGuide and http://wiki.freebsd.org/ZFSTuningGuide which didn't mention any tuning for amd64 with plenty of memory I had thought 9-CURRENT should "just work". Is the tuning of vm.kmem_size really needed? I've seen mention of an ARC tunable too - does it need changed? -- Bruce Cran
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