linux-kernel - Re: [PATCH bpf-next 4/5] selftests/bpf: Add benchmark for bpf_csum

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Message-ID: <4ca8a746-263f-450d-af8d-64ba181a443f@iogearbox.net>
Date: Mon, 21 Oct 2024 15:43:50 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Puranjay Mohan <puranjay@...nel.org>, Albert Ou <aou@...s.berkeley.edu>,
 Alexei Starovoitov <ast@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
 "David S. Miller" <davem@...emloft.net>, Eduard Zingerman
 <eddyz87@...il.com>, Eric Dumazet <edumazet@...gle.com>,
 Hao Luo <haoluo@...gle.com>, Helge Deller <deller@....de>,
 Jakub Kicinski <kuba@...nel.org>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Jiri Olsa <jolsa@...nel.org>, John Fastabend <john.fastabend@...il.com>,
 KP Singh <kpsingh@...nel.org>, linux-kernel@...r.kernel.org,
 linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
 Martin KaFai Lau <martin.lau@...ux.dev>, Mykola Lysenko <mykolal@...com>,
 netdev@...r.kernel.org, Palmer Dabbelt <palmer@...belt.com>,
 Paolo Abeni <pabeni@...hat.com>, Paul Walmsley <paul.walmsley@...ive.com>,
 Puranjay Mohan <puranjay12@...il.com>, Shuah Khan <shuah@...nel.org>,
 Song Liu <song@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
 Yonghong Song <yonghong.song@...ux.dev>
Subject: Re: [PATCH bpf-next 4/5] selftests/bpf: Add benchmark for
 bpf_csum_diff() helper

On 10/21/24 2:21 PM, Puranjay Mohan wrote:
> Add a microbenchmark for bpf_csum_diff() helper. This benchmark works by
> filling a 4KB buffer with random data and calculating the internet
> checksum on different parts of this buffer using bpf_csum_diff().
> 
> Example run using ./benchs/run_bench_csum_diff.sh on x86_64:
> 
> [bpf]$ ./benchs/run_bench_csum_diff.sh
> 4                    2.296 ± 0.066M/s (drops 0.000 ± 0.000M/s)
> 8                    2.320 ± 0.003M/s (drops 0.000 ± 0.000M/s)
> 16                   2.315 ± 0.001M/s (drops 0.000 ± 0.000M/s)
> 20                   2.318 ± 0.001M/s (drops 0.000 ± 0.000M/s)
> 32                   2.308 ± 0.003M/s (drops 0.000 ± 0.000M/s)
> 40                   2.300 ± 0.029M/s (drops 0.000 ± 0.000M/s)
> 64                   2.286 ± 0.001M/s (drops 0.000 ± 0.000M/s)
> 128                  2.250 ± 0.001M/s (drops 0.000 ± 0.000M/s)
> 256                  2.173 ± 0.001M/s (drops 0.000 ± 0.000M/s)
> 512                  2.023 ± 0.055M/s (drops 0.000 ± 0.000M/s)
> 
> Signed-off-by: Puranjay Mohan <puranjay@...nel.org>

Acked-by: Daniel Borkmann <daniel@...earbox.net>