[Samba] performance regression between 30.14a and 3.0.20

Greg Dickie greg at max-t.com
Wed Apr 26 17:20:23 GMT 2006

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?


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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