On Sat, 2007-10-13 at 10:55 +0200, Peter Zijlstra wrote:
> On Sat, 2007-10-13 at 09:18 +0200, Mike Galbraith wrote:
> > On Fri, 2007-10-12 at 22:51 +0200, Peter Zijlstra wrote:
> > > Subject: sched: high-res preemption tick
> > >
> > > Use HR-timers (when available) to deliver an accurate preemption tick.
> >
> > This patch further reduced iperf context switching, and boosted
> > throughput.
> >
> > iperf -c localhost -P 10 -t 300
> >
> > Previously reported numbers
> >
> > 2.6.23-smp
> > [SUM] 0.0-300.0 sec 153 GBytes 4.39 Gbits/sec
> > [SUM] 0.0-300.1 sec 148 GBytes 4.23 Gbits/sec
> > [SUM] 0.0-300.0 sec 152 GBytes 4.36 Gbits/sec
> >
> > 2.6.23-smp-d (sched-devel)
> > [SUM] 0.0-300.0 sec 173 GBytes 4.96 Gbits/sec
> > [SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec
> > [SUM] 0.0-300.0 sec 172 GBytes 4.93 Gbits/sec
> >
> > Numbers from fresh pull today
> >
> > 2.6.23-smp-d-hrt
> > (re-enable PREEMPT_RESTRICT)
>
> Ah, but HRTICK is not compatible with PREEMPT_RESTRICT, it will be
> similar to !WAKEUP_PREEMPT.
(I do plan to fix that eventually, just need to do it)
Also, this seems to suggest iperf would like SCHED_BATCH.
> > [SUM] 0.0-300.1 sec 181 GBytes 5.19 Gbits/sec
> > [SUM] 0.0-300.0 sec 182 GBytes 5.22 Gbits/sec
> > [SUM] 0.0-300.1 sec 182 GBytes 5.22 Gbits/sec
> >
> > 2.6.23-smp-d
> > [SUM] 0.0-300.1 sec 174 GBytes 4.97 Gbits/sec
> > [SUM] 0.0-300.1 sec 173 GBytes 4.95 Gbits/sec
> > [SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec
> >
> >
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