On Mon, Apr 26, 2004 at 01:52:47PM -0500, Steve Lord wrote:
> The very wierd part is the slowdown you see with an external journal
> in the last case. I can see no reason why an external vs an internal
> journal would be different except for the possibility that there
> is some form of interaction with queue unplugging in the elevators
> between devices. It might be worth trying Linus's latest bitkeeper
> tree (2.6.6-rc2) which has per device queue unplugging and see
> if that makes a difference.
I am currently re-running some of the tests with 2.6.6-rc2-mm2. I'll
re-run with XFS too and post my results.
> Your website also comments on xfs read performance slowing down
> when there are a large number of files present. Can you define
> 'a large number of files'.
Large is perhaps an exaggeration. On the order of 100,000 files
(averaging roughly one per directory).
> I attached a perl script. If you run this once a second and capture the
> output when things are going bad it might tell us a few things.
I'll do that.
Bruce Guenter <bruceg@xxxxx> http://em.ca/~bruceg/ http://untroubled.org/
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