Re: SDP perf drop with 2.6.15

From: Michael S. Tsirkin <mst_at_mellanox.co.il>
Date: 2006-01-13 06:58:28
Quoting r. Grant Grundler <iod00d@hp.com>:
> Subject: Re: SDP perf drop with 2.6.15
> 
> On Thu, Jan 12, 2006 at 09:18:03AM +0200, Michael S. Tsirkin wrote:
> > > Makes me think it's a change in the interrupt code path.
> > > Any clues on where I might start with this?
> > 
> > oprofile should show where we are spending the time.
> 
> Executive summary:
> 	Silly me. interrupt bindings changed and I didn't check after rolling
> 	to 2.6.15 (from 2.6.14). That explains the increase cpu utilization
> 	with lower performance.
> 	Getting similar performance with -T 0,0 (2.6.15) vs -T 1,1 (2.6.14).
> 

OK, so we are left with the ref count now.
I'm seeing this myself sometimes, I have some other stuff to attend to
next week, and then I plan to look into this.

-- 
MST
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Received on Fri Jan 13 06:59:03 2006

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