Re: hackbench regression due to commit 9dfc6e68bfe6e

[Eric Dumazet]

Le jeudi 08 avril 2010 Ã 09:54 +0200, Eric Dumazet a Ãcrit :
> Le jeudi 08 avril 2010 Ã 15:54 +0800, Zhang, Yanmin a Ãcrit :
> 
> > 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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