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

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Date:   Fri, 17 Nov 2023 12:35:49 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     David Howells <dhowells@...hat.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        kernel test robot <oliver.sang@...el.com>,
        oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org,
        Christian Brauner <brauner@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>,
        Matthew Wilcox <willy@...radead.org>,
        David Laight <David.Laight@...lab.com>, ying.huang@...el.com,
        feng.tang@...el.com, fengwei.yin@...el.com
Subject: Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput
 -16.9% regression

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.

https://people.kernel.org/tglx/notes-about-netiquette