Messages in this thread |  | | Date | Tue, 30 Oct 2001 21:48:40 +0100 | From | Manfred Spraul <> | Subject | Re: [Lse-tech] Re: Patch and Performance of larger pipes |
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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.
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