On Thu, May 18, 2017 at 1:59 PM, Erich Elsen <eriche@google.com> wrote:
> Hi H.J.,
>
> I was on vacation, sorry for the slow reply.  The updated benchmark
> still shows the same behavior, thanks.
>
> I'll try my hand at creating a patch that makes that variable
> __x86_shared_non_temporal_threshold a tunable.  It will be necessary
> to do internal experiments anyway.
>

__x86_shared_non_temporal_threshold was set to 6 times of per-core
shared cache size, based on the large memcpy micro benchmark in glibc
on a 8-core processor.  For a processor with more than 8 cores, the
threshold is too low.  Set __x86_shared_non_temporal_threshold to the
3/4 of the total shared cache size so that it is unchanged on 8-core
processors.  On processors with less than 8 cores, the threshold is
lower.

Any comments?

-- 
H.J.