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Date: Thu, 08 Apr 2010 10:09:55 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> Cc: Christoph Lameter <cl@...ux-foundation.org>, Pekka Enberg <penberg@...helsinki.fi>, netdev <netdev@...r.kernel.org>, Tejun Heo <tj@...nel.org>, alex.shi@...el.com, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Ma, Ling" <ling.ma@...el.com>, "Chen, Tim C" <tim.c.chen@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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