netdev - Re: [PATCH bpf-next v4] selftests/bpf: Add LPM trie microbenchmarks

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Message-ID: <CAADnVQ+=bYcR6whXxEPst4a4n1eKeDXp4tO8Q2wEx_6GbwqMFg@mail.gmail.com>
Date: Tue, 26 Aug 2025 16:49:50 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Matt Fleming <matt@...dmodwrite.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Eduard Zingerman <eddyz87@...il.com>, Shuah Khan <shuah@...nel.org>, 
	kernel-team <kernel-team@...udflare.com>, Jesper Dangaard Brouer <hawk@...nel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	bpf <bpf@...r.kernel.org>, Martin KaFai Lau <martin.lau@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, Network Development <netdev@...r.kernel.org>, 
	Matt Fleming <mfleming@...udflare.com>
Subject: Re: [PATCH bpf-next v4] selftests/bpf: Add LPM trie microbenchmarks

On Tue, Aug 26, 2025 at 6:12 AM Matt Fleming <matt@...dmodwrite.com> wrote:
>
> +static int baseline(__u32 index, __u32 *unused)
> +{
> +       struct trie_key key;
> +       __s64 blackbox;
> +
> +       generate_key(&key);
> +       /* Avoid compiler optimizing out the modulo */
> +       barrier_var(blackbox);
> +       blackbox = READ_ONCE(key.data);

Overall looks good, but gcc-bpf found an actual issue.

pw-bot: cr