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SubjectRe: [Lse-tech] Re: Patch and Performance of larger pipes
Hubertus Franke wrote:
>
> Manfred, here is some more performance measurement and comparision
> to round up some of the stuff we have been doing.
> It would be nice if you could make some comments. As usual raw numbers
> is not everything and there are other issues to consider.
> Comments ?
>
I'm that much interested at SMP performance right now - most of the SMP
problems are bad interactions with the scheduler. The current scheduler
and the pipe implementation are "optimized" for each other, e.g.
wake_up_sync() is IIRC exclusively used by pipes.

>
> UP
> --
> %imp
> R.Size W.Size R.Compute W.Compute 2.4.9.pipe Manfred
> ------ ------ ------------------- ---------- --------------
> 512 32k 500 0 0 1.04
> 512 32k 0 500 -0.91 7.72
>
> 32k 512 500 0 1.09 -78.3
> 32k 512 0 500 0 0
>
I'll try to check that one ASAP. An uniprocessor performance degration
points to an implementation bug in my code.

--
Manfred
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