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SubjectRe: hackbench regression due to commit 9dfc6e68bfe6e
FromEric Dumazet <>
DateThu, 08 Apr 2010 10:09:55 +0200
Le jeudi 08 avril 2010 à 09:54 +0200, Eric Dumazet a écrit :
> Le jeudi 08 avril 2010 à 15:54 +0800, Zhang, Yanmin a écrit :
>
> > If there are 2 nodes in the machine, processes on node 0 will contact MCH of
> > node 1 to access memory of node 1. I suspect the MCH of node 1 might enter
> > a power-saving mode when all the cpus of node 1 are free. So the transactions
> > from MCH 1 to MCH 0 has a larger latency.
> >
>
> Hmm, thanks for the hint, I will investigate this.

Oh well,

perf timechart record &

Instant crash

Call Trace:
perf_trace_sched_switch+0xd5/0x120
schedule+0x6b5/0x860
retint_careful+0xd/0x21

RIP ffffffff81010955 perf_arch_fetch_caller_regs+0x15/0x40
CR2: 00000000d21f1422

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