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SubjectRe: [GIT PULL] x86/misc for 6.5
On Tue, 27 Jun 2023 at 14:44, Arjan van de Ven <arjan@linux.intel.com> wrote:
>
> fwiw long flights and pools have a relation; I made a userspace testbench
> for this some time ago: https://github.com/fenrus75/csum_partial
> in case one would actually WANT to test ;)

Hmm.

I don't know what the rules are - and some of the functions you test
seem actively buggy (ie not handling alignment right etc).

But on my machine I get:

02: 8.6 / 10.4 cycles (e29e455e) Upcoming linux kernel version
04: 8.6 / 10.4 cycles (e29e455e) Specialized to size 40
06: 7.7 / 9.5 cycles (e29e455e) New version
22: 8.7 / 9.6 cycles (e29e455e) Odd-alignment handling removed
...

which would seem to mean that my code ("New version") is doing well.

It does do worse on the "odd alignment" case:

03: 15.5 / 17.8 cycles (00006580) Upcoming linux kernel version
05: 15.5 / 17.8 cycles (00006580) Specialized to size 40
07: 16.6 / 19.5 cycles (0000bc29) New version
23: 8.8 / 8.6 cycles (1de29e47) Odd-alignment handling removed
...

I just hacked the code into the benchmark without looking too closely
at what is going on, so no guarantees.

Linus

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