Robert Milkowski wrote:
Hello Richard,
Thursday, August 31, 2006, 8:17:41 AM, you wrote:
RLH> Are both of you doing a umount/mount (or export/import, I guess) of the
RLH> source filesystem before both first and second test? Otherwise, there
might
RLH> still be a fair bit of cached data left over from the first test, which
would
RLH> give the 2nd an unfair advantage. I'm fairly sure unmounting a filesystem
RLH> invalidates all cached pages associated with files on that filesystem, as
well
RLH> as any cached [iv]node entries, all of which in needed to ensure both tests
RLH> are starting from the most similar situation possible. Ideally, all this
would
RLH> even be done in single-user mode, so that nothing else could interfere.
IIRC unmounting ZFS file system won't flush its caches - you've got to
export entire pool.
That's correct. And I did ensure that the data was not cached before
each of my tests.
--matt
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