Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

From: Ingo Molnar
Date: Tue Oct 29 2013 - 09:11:58 EST



* Neil Horman <nhorman@xxxxxxxxxxxxx> wrote:

> I'm sure it worked properly on my system here, I specificially
> checked it, but I'll gladly run it again. You have to give me an
> hour as I have a meeting to run to, but I'll have results shortly.

So what I tried to react to was this observation of yours:

> > > Heres my data for running the same test with taskset
> > > restricting execution to only cpu0. I'm not quite sure whats
> > > going on here, but doing so resulted in a 10x slowdown of the
> > > runtime of each iteration which I can't explain. [...]

A 10x slowdown would be consistent with not running your testcase
but 'perf bench sched messaging' by accident, or so.

But I was really just guessing wildly here.

Thanks,

Ingo
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