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Date: Thu, 16 Jan 2014 11:12:19 -0800 From: Dave Hansen <dave.hansen@...el.com> To: kernel test robot <fengguang.wu@...el.com> CC: LKML <linux-kernel@...r.kernel.org>, lkp@...ux.intel.com Subject: Re: [slub shrink] 0f6934bf16: +191.9% vmstat.system.cs On 01/15/2014 07:07 PM, kernel test robot wrote: > 9a0bb2966efbf30 0f6934bf1695682e7ced973f6 > --------------- ------------------------- > 8235933 ~ 2% +80.6% 14872911 ~ 3% lkp-sbx04/micro/will-it-scale/read2 > 8235933 +80.6% 14872911 TOTAL interrupts.RES > > 9a0bb2966efbf30 0f6934bf1695682e7ced973f6 > --------------- ------------------------- > 161531 ~ 7% +191.9% 471544 ~ 9% lkp-sbx04/micro/will-it-scale/read2 > 161531 +191.9% 471544 TOTAL vmstat.system.cs > > 9a0bb2966efbf30 0f6934bf1695682e7ced973f6 > --------------- ------------------------- > 32943 ~ 1% +71.8% 56599 ~ 3% lkp-sbx04/micro/will-it-scale/read2 > 32943 +71.8% 56599 TOTAL vmstat.system.in I suspect that something is wrong with that system. My 160-cpu system does about 40,000 interrupts/sec and ~4300 context switches/sec when running 160 read2_processes. I wonder if you're hitting swap or the dirty limits or something. Are you running it with way more threads than it has CPUs? Also, are those will-it-scale tests the threaded or process versions? -- 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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