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SubjectRe: [RFC][PATCH 0/7] sched: select_idle_siblings rewrite
On Mon, May 09, 2016 at 12:48:07PM +0200, Peter Zijlstra wrote:
> Hai,
>
> here be a semi coherent patch series for the recent select_idle_siblings()
> tinkering. Happy benchmarking..

Thanks Peter,

I'll have some production numbers tomorrow, but based on schbench I'm
hoping it'll score better than my original.

You win on the pipe test (1.9MB/s vs 2.1MB/s) when a thread sibling is
pegged, and even when I double the think time on schbench, it holds up
well:

# Peter
# ./schbench -t 23 -m 2 -c 60000 -s 30000
Latency percentiles (usec)
50.0000th: 50
75.0000th: 60
90.0000th: 69
95.0000th: 73
*99.0000th: 85
99.5000th: 135
99.9000th: 4012
min=0, max=10873

# Mason
# ./schbench -t 23 -m 2 -c 60000 -s 30000
Latency percentiles (usec)
50.0000th: 50
75.0000th: 60
90.0000th: 70
95.0000th: 74
*99.0000th: 83
99.5000th: 88
99.9000th: 118
min=0, max=14770

# Mainline
# ./schbench -t 23 -m 2 -c 60000 -s 30000
Latency percentiles (usec)
50.0000th: 47
75.0000th: 60
90.0000th: 70
95.0000th: 79
*99.0000th: 5400
99.5000th: 10352
99.9000th: 10992
min=0, max=19642

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