OK all my gobbledy-gook stats aside..... sorry for being incoherent.
Stracing reveals that files after 3.0.20b are opened with O_SYNC. Could
that be the source of the problems? I'll try and find that and test it
when I get home but the question is is it necessary?
Thanks,
Greg
Jeremy Allison wrote:
On Mon, Apr 24, 2006 at 10:56:29AM -0400, Greg Dickie wrote:
Hey Jeremy,
Sorry, I'm at NAB in vegas and a little burned myself.... so we graph
output from /proc/diskstats when we test. If I run a test with 3.0.21c
the wio (field 7) and wblk (field 9) stats both show activity. This does
not happen with 3.0.14a. eg: it appears that there is double the amount
of write traffic.
Does that make any more sense?
Not really :-). I don't know enough about xfs to be dangerous :-).
Is it possible we're doing larger bulk writes with 3.0.2x that
we weren't doing with 3.0.14a which might trigger this ? In which
case it'd be an xfs issue not a Samba one. Can you test with ext3
jfs or reiser to see if they show different performance characteristics ?
Jeremy
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