[Samba] performance regression between 30.14a and 3.0.20

[Jeremy Allison]

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