From: Alexei Starovoitov <ast@fb.com>
To: Andrii Nakryiko <andriin@fb.com>, <bpf@vger.kernel.org>,
<netdev@vger.kernel.org>, <daniel@iogearbox.net>
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>
Subject: Re: [PATCH bpf-next 3/3] selftest/bpf: add BPF triggring benchmark
Date: Fri, 8 May 2020 09:40:10 -0700 [thread overview]
Message-ID: <35e656a9-91d1-203d-44d4-ea5f002ad232@fb.com> (raw)
In-Reply-To: <20200508070548.2358701-4-andriin@fb.com>
On 5/8/20 12:05 AM, Andrii Nakryiko wrote:
>
> base : 9.200 ± 0.319M/s
> fentry : 8.955 ± 0.241M/s
> +SEC("fentry/__x64_sys_getpgid")
> +int bench_trigger_fentry(void *ctx)
> +{
> + __sync_add_and_fetch(&hits, 1);
> + return 0;
> +}
adding 'lock xadd' is not cheap.
I wonder how much of the delta come from it and from the rest of
trampoline.
next prev parent reply other threads:[~2020-05-08 16:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 7:05 [PATCH bpf-next 0/3] Add benchmark runner and few benchmarks Andrii Nakryiko
2020-05-08 7:05 ` [PATCH bpf-next 1/3] selftests/bpf: add benchmark runner infrastructure Andrii Nakryiko
2020-05-08 15:49 ` John Fastabend
2020-05-08 17:59 ` Andrii Nakryiko
2020-05-08 7:05 ` [PATCH bpf-next 2/3] selftest/bpf: fmod_ret prog and implement test_overhead as part of bench Andrii Nakryiko
2020-05-08 15:57 ` John Fastabend
2020-05-08 18:01 ` Andrii Nakryiko
2020-05-08 7:05 ` [PATCH bpf-next 3/3] selftest/bpf: add BPF triggring benchmark Andrii Nakryiko
2020-05-08 16:02 ` John Fastabend
2020-05-08 16:40 ` Alexei Starovoitov [this message]
2020-05-08 17:50 ` Andrii Nakryiko
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