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    SubjectRe: [PATCH] sched: high-res preemption tick
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    Date
    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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