On Fri, 2006-06-09 at 08:55 -0700, Daniel Walker wrote:
> 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 ?
Bare minimum. None of the other tasks that were scheduled were rt in
their own right though.
-Mike
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