Re: [PATCH v2] x86/csum: rewrite csum_partial()

On Fri, Nov 12, 2021 at 9:23 AM Eric Dumazet [off-list ref] wrote:

On Fri, Nov 12, 2021 at 8:45 AM Peter Zijlstra [off-list ref] wrote:

quoted

quoted

Looks nice, happen to have shiny perf numbers to show how awesome it it?
:-)

On a networking load on cascadlake, line rate received on a single thread, I see
perf -e cycles:pp -C <cpu>

Before:
       4.16%  [kernel]       [k] csum_partial
After:
        0.83%  [kernel]       [k] csum_partial

If run in a loop 1,000,000 times,

However, there must be an error in my patch, return values are not the
same on unaligned buffers.