Date: Tue, 9 Jun 2009 18:22:40 -0700 From: Kip Macy <kmacy@freebsd.org> To: freebsd-fs@freebsd.org Subject: heads up on prefetch tunable in ZFS Message-ID: <3c1674c90906091822x56be5f2bg5b6156618847cc21@mail.gmail.com>
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As far as I can tell systems that have less than 4GB are more often hurt by prefetched than helped. On i386 systems and systems with less than 4GB, as of 193878 prefetch is now disabled by default. I've added a prefetch enable tunable, to enable prefetching for those systems. The prefetch disable tunable will continue to unconditionally disable prefetching. Cheers, Kip
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