Re: [Patches] [PATCH] ARM: NEON detected memcpy.

["Carlos O'Donell" <carlos@xxxxxxxxxx>]

On 04/09/2013 11:00 AM, Richard Earnshaw wrote:
>> At present the only policy we have as a community is that faster is
>> always better.
> 
> 
> You still have to be careful how you measure 'faster'.  Repeatedly
> running the same fragment of code under the same boundary conditions
> will only ever give you the 'warm caches' number (I, D and branch
> target), but if the code is called cold (or with different boundary
> conditions in the case of the Branch target cache) most of the time
> in real life, that's unlikely to be very meaningful.

Agreed, but that's what whole system benchmarking is for.

We can't solve all problems at once, and we had zero benchmarking
before we started this work for 2.18.

Hopefully by 2.20 or 2.21 we have some kind of whole system
benchmarking that allows users to monitor their system, gather
data, and submit it back to the project for analysis.

Cheers,
Carlos.
_______________________________________________
Patches mailing list
Patches@xxxxxxxxxx
http://eglibc.org/cgi-bin/mailman/listinfo/patches