On Fri, 2006-06-09 at 15:42 +0200, Mike Galbraith wrote:
> On Fri, 2006-06-09 at 15:11 +0200, Thomas Gleixner wrote:
> > On Fri, 2006-06-09 at 14:57 +0200, Sébastien Dugué wrote:
> > > All the round trips under strace are in the 2ms range.
> > >
> > > How on earth can it be that stracing the ping gives better
> > > performance???
> >
> > Was busy fixing a scheduling while atomic bug. I just verified that I
> > have the same weird behaviour. I'm looking into it.
>
> I downloaded and patched a ping.c to do a user triggered latency trace
> around recvfrom() of a ping -c 1 127.0.0.1 running SCHED_RR. We
> schedule away at 25us, do aaaall kinds of interesting stuff, and come
> back at 42234us. If you want the trace, holler. It's 51k bzipped.
What priority ?
Daniel
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