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Re: [PATCH] i386 copy.S routine optimization?
Le 10/06/13 22:24, Greg Troxel a écrit :
Have you run a full test suite (atf-run) with and without the patch.
Have you done a full build.sh release run (no objdirs, just after boot
so clear caches) both ways? results?
I didn't run any test suite for now because I only sent the patch knowing
that it's not to be applied - a priori - because of some subtlety about
x86 pipeline and cache that I actually am looking forward to understand
if someone has the time to explain it on the mailing list.
I actually showed this patch to Radoslaw Kujawa who then showed it to
David Holland, the latter said, I quote:
"My guess is that it's faster the way it is due to pipelining and
probable cache stalls;"
My intention, by sending my previous e-mail, was to seek some precisions
about the pipeline/cache subtlety
that would make my patch (which seems "good" from a newbie point of
view) slower than the current code.
I am sorry if I mislead you in thinking this patch was tested and good
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