Messages in this thread | | | Date | Fri, 21 Nov 2008 19:19:39 +0100 | From | Eric Dumazet <> | Subject | Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 |
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Eric Dumazet a écrit : > Christoph Lameter a écrit : >> AIM9 results: >> TCP UDP >> 2.6.22 104868.00 489970.03 >> 2.6.28-rc5 110007.00 518640.00 >> net-next 108207.00 514790.00 >> >> net-next looses here for some reason against 2.6.28-rc5. But the numbers >> are better than 2.6.22 in any case. >> > > I found that on current net-next, running oprofile in background can > give better bench > results. Thats really curious... no ? > > > So the single loop on close(socket()), on all my 8 cpus is almost 10% > faster if oprofile > is running... (20 secs instead of 23 secs) >
Oh well, thats normal, since when a cpu is interrupted by a NMI, and distracted by oprofile code, it doesnt fight with other cpus on dcache_lock and other contended cache lines...
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