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SubjectRe: [PATCH] perf: Update event buffer tail when overwriting old events
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@intel.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?


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