Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's
From: Eric Dumazet
Date: Tue Oct 15 2013 - 20:34:17 EST
On Tue, 2013-10-15 at 09:21 -0700, Joe Perches wrote:
> Ingo, Eric _showed_ that the prefetch is good here.
> How about looking at a little optimization to the minimal
> prefetch that gives that level of performance.
Wait a minute, my point was to remind that main cost is the
memory fetching.
Its nice to optimize cpu cycles if we are short of them,
but in the csum_partial() case, the bottleneck is the memory.
Also I was wondering on the implications of changing reads order,
as it might fool cpu predictions.
I do not particularly care about finding the right prefetch stride,
I think Intel guys know better than me.
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