netdev - Re: [PATCH bpf-next 3/3] selftest/bpf: add BPF triggring benchmark

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Message-ID: <35e656a9-91d1-203d-44d4-ea5f002ad232@fb.com>
Date:   Fri, 8 May 2020 09:40:10 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Andrii Nakryiko <andriin@...com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <daniel@...earbox.net>
CC:     <andrii.nakryiko@...il.com>, <kernel-team@...com>
Subject: Re: [PATCH bpf-next 3/3] selftest/bpf: add BPF triggring benchmark

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.