Le 17/08/2015 12:56, leroy christophe a écrit :
Le 07/08/2015 01:25, Segher Boessenkool a écrit :
On Thu, Aug 06, 2015 at 05:45:45PM -0500, Scott Wood wrote:
If this makes performance non-negligibly worse on other 32-bit
chips, and is
an important improvement on 8xx, then we can use an ifdef since 8xx
already
requires its own kernel build. I'd prefer to see a benchmark
showing that it
actually does make things worse on those chips, though.
And I'd like to see a benchmark that shows it *does not* hurt
performance
on most chips, and does improve things on 8xx, and by how much. But it
isn't *me* who has to show that, it is not my patch.
Ok, following this discussion I made some additional measurement and
it looks like:
* There is almost no change on the 885
* There is a non negligeable degradation on the 8323 (19.5 tb ticks
instead of 15.3)
Thanks for pointing this out, I think my patch is therefore not good.
Oops, I was talking about my other past, the one that was to optimise
ip_csum_fast.
I still have to measure csum_partial
Christophe
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