Re: [PATCH] sched: high-res preemption tick

[Mike Galbraith]

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)
[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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