Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression

Borislav Petkov
2023-11-17T11:36:23Z

On Thu, Nov 16, 2023 at 04:44:06PM +0000, David Howells wrote:
> If you wanted this patch trying, I get the following numbers:
>
> iov_kunit_benchmark_bvec: avg 9950 uS, stddev 40 uS
> iov_kunit_benchmark_bvec: avg 9950 uS, stddev 53 uS
> iov_kunit_benchmark_bvec: avg 9973 uS, stddev 69 uS
> iov_kunit_benchmark_bvec_split: avg 9793 uS, stddev 28 uS
> iov_kunit_benchmark_bvec_split: avg 9800 uS, stddev 41 uS
> iov_kunit_benchmark_bvec_split: avg 9804 uS, stddev 16 uS
> iov_kunit_benchmark_kvec: avg 10122 uS, stddev 4403 uS
> iov_kunit_benchmark_kvec: avg 9757 uS, stddev 1516 uS
> iov_kunit_benchmark_kvec: avg 9909 uS, stddev 2694 uS
> iov_kunit_benchmark_xarray: avg 10526 uS, stddev 52 uS
> iov_kunit_benchmark_xarray: avg 10529 uS, stddev 48 uS
> iov_kunit_benchmark_xarray: avg 10532 uS, stddev 63 uS
> iov_kunit_benchmark_xarray_to_bvec: avg 10468 uS, stddev 23 uS
> iov_kunit_benchmark_xarray_to_bvec: avg 10469 uS, stddev 157 uS
> iov_kunit_benchmark_xarray_to_bvec: avg 10471 uS, stddev 163 uS

Hmm, stupid question: are those results better than without that
oneliner?

I don't see those same numbers done without this patch - maybe I can't
find them in the thread or so...

Thx.

--
Regards/Gruss,
Boris.