On Thu, 10 Sep 2009, Rich Morris wrote:
Excellent. What level of read improvement are you seeing? Is the prefetch
rate improved, or does the fix simply avoid losing the prefetch?
This fix avoids using a prefetch stream when it is no longer valid. BTW, ZFS
prefetch appears to work well for most prefetch patterns. But this CR found
a pattern that should have worked well but did not.
It seems that after doing a fresh mount, the zfs prefetch is not quite
enough to keep my hungry highly-tuned application sufficiently well
fed. I will have to wait and see though.
In the mean time, I need to investigate why recent Solaris 10 kernel
patches (141415-10) cause my Sun Ultra-40M2 system to panic five
minutes into 'zpool scrub' with a fault being reported against the
motherboard. Maybe a few more motherboard swaps will solve it (on 4th
motherboard now). 141415-3 seems less likely to panic since it
survives a full scrub (unless VirtualBox is running a Linux instance).
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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