On Wed, Apr 01, 2015 at 11:23:34AM +0800, Huang Ying wrote:
> FYI, we noticed the below changes on
>
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit b191f9b106ea1a24a711dbebb2925d3313da5852 ("mm: numa: preserve PTE
> write permissions across a NUMA hinting fault")
>
>
> testbox/testcase/testparams:
> lkp-ne02/netperf/performance-300s-200%-TCP_SENDFILE
>
> bea66fbd11af1ca9 b191f9b106ea1a24a711dbebb2
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 13115 ± 0% -8.8% 11968 ± 0% netperf.time.minor_page_faults
> 65.63 ± 6% -14.6% 56.05 ± 7% netperf.time.user_time
> 65.63 ± 6% -14.6% 56.05 ± 7% time.user_time
Hmmm, is this a positive report? It looks like it -- fewer faults at
least. Lower user_time is ambiguous because the elapsed time is not
included in the report and netperf has variable time depending on
whether it can get a confident result or not.
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