From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Joanne Koong <joannekoong@fb.com>
Cc: bpf <bpf@vger.kernel.org>, Andrii Nakryiko <andrii@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Kernel Team <Kernel-team@fb.com>
Subject: Re: [PATCH v3 bpf-next 4/4] selftest/bpf/benchs: add bpf_loop benchmark
Date: Mon, 29 Nov 2021 15:02:16 -0800 [thread overview]
Message-ID: <CAEf4BzauvgM0zd1f5UX2rAqHG2cgp0r578nvG_QRhmfN8i+jqw@mail.gmail.com> (raw)
In-Reply-To: <20211129223725.2770730-5-joannekoong@fb.com>
On Mon, Nov 29, 2021 at 2:39 PM Joanne Koong <joannekoong@fb.com> wrote:
>
> Add benchmark to measure the throughput and latency of the bpf_loop
> call.
>
> Testing this on my dev machine on 1 thread, the data is as follows:
>
> nr_loops: 10
> bpf_loop - throughput: 198.519 ± 0.155 M ops/s, latency: 5.037 ns/op
>
> nr_loops: 100
> bpf_loop - throughput: 247.448 ± 0.305 M ops/s, latency: 4.041 ns/op
>
> nr_loops: 500
> bpf_loop - throughput: 260.839 ± 0.380 M ops/s, latency: 3.834 ns/op
>
> nr_loops: 1000
> bpf_loop - throughput: 262.806 ± 0.629 M ops/s, latency: 3.805 ns/op
>
> nr_loops: 5000
> bpf_loop - throughput: 264.211 ± 1.508 M ops/s, latency: 3.785 ns/op
>
> nr_loops: 10000
> bpf_loop - throughput: 265.366 ± 3.054 M ops/s, latency: 3.768 ns/op
>
> nr_loops: 50000
> bpf_loop - throughput: 235.986 ± 20.205 M ops/s, latency: 4.238 ns/op
>
> nr_loops: 100000
> bpf_loop - throughput: 264.482 ± 0.279 M ops/s, latency: 3.781 ns/op
>
> nr_loops: 500000
> bpf_loop - throughput: 309.773 ± 87.713 M ops/s, latency: 3.228 ns/op
>
> nr_loops: 1000000
> bpf_loop - throughput: 262.818 ± 4.143 M ops/s, latency: 3.805 ns/op
>
> From this data, we can see that the latency per loop decreases as the
> number of loops increases. On this particular machine, each loop had an
> overhead of about ~4 ns, and we were able to run ~250 million loops
> per second.
>
> Signed-off-by: Joanne Koong <joannekoong@fb.com>
> ---
LGTM.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
> tools/testing/selftests/bpf/Makefile | 4 +-
> tools/testing/selftests/bpf/bench.c | 37 ++++++
> tools/testing/selftests/bpf/bench.h | 2 +
> .../selftests/bpf/benchs/bench_bpf_loop.c | 105 ++++++++++++++++++
> .../bpf/benchs/run_bench_bpf_loop.sh | 15 +++
> .../selftests/bpf/benchs/run_common.sh | 15 +++
> .../selftests/bpf/progs/bpf_loop_bench.c | 26 +++++
> 7 files changed, 203 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/bpf/benchs/bench_bpf_loop.c
> create mode 100755 tools/testing/selftests/bpf/benchs/run_bench_bpf_loop.sh
> create mode 100644 tools/testing/selftests/bpf/progs/bpf_loop_bench.c
[...]
next prev parent reply other threads:[~2021-11-29 23:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-29 22:37 [PATCH v3 bpf-next 0/4] Add bpf_loop helper Joanne Koong
2021-11-29 22:37 ` [PATCH v3 bpf-next 1/4] bpf: " Joanne Koong
2021-11-29 22:48 ` Andrii Nakryiko
2021-11-30 16:54 ` Toke Høiland-Jørgensen
2021-11-29 22:37 ` [PATCH v3 bpf-next 2/4] selftests/bpf: Add bpf_loop test Joanne Koong
2021-11-29 22:52 ` Andrii Nakryiko
2021-11-29 22:37 ` [PATCH v3 bpf-next 3/4] selftests/bpf: measure bpf_loop verifier performance Joanne Koong
2021-11-29 22:55 ` Andrii Nakryiko
2021-11-29 22:37 ` [PATCH v3 bpf-next 4/4] selftest/bpf/benchs: add bpf_loop benchmark Joanne Koong
2021-11-29 23:02 ` Andrii Nakryiko [this message]
2021-11-30 16:53 ` Toke Høiland-Jørgensen
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