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Message-ID: <51DE0073.3020403@intel.com> Date: Thu, 11 Jul 2013 08:46:43 +0800 From: "Yan, Zheng" <zheng.z.yan@...el.com> To: Peter Zijlstra <peterz@...radead.org> CC: linux-kernel@...r.kernel.org, mingo@...e.hu, eranian@...gle.com, ak@...ux.intel.com Subject: Re: [PATCH] perf: Update event buffer tail when overwriting old events On 07/10/2013 07:44 PM, Peter Zijlstra wrote: > On Wed, Jul 10, 2013 at 07:37:43PM +0800, Yan, Zheng wrote: >> On 07/08/2013 08:15 PM, Peter Zijlstra wrote: >>> On Thu, Jun 06, 2013 at 01:58:06PM +0800, Yan, Zheng wrote: >>>> From: "Yan, Zheng" <zheng.z.yan@...el.com> > >>>> before overwrite mode after overwrite mode >>>> AVG 1000 999 1046 1044 >>>> STDEV 19.4 19.5 17.1 17.9 >>> >>> OK, so I was sure I replied to this email; but apparently I didn't :/ >>> >>> So its still adding about 5% overhead to the regular case; this is sad. >>> >>> What does something like the below do? >>> >> >> I re-test the patch on a different 32 core sandybridge-ep machine. the result is quite good. >> >> origin origin overwrite modified modified overwrite >> AVG 1000 1044 960 1006 >> STDEV 39.0 26.0 28.1 14.4 > > Nice! -- you did fix the snafu for the overwrite more before testing right? > yes, of course. Regards Yan, Zheng -- 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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