From: Jakub Kicinski <kuba@kernel.org>
To: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: bpf@vger.kernel.org, mrpre@163.com,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Mykola Lysenko <mykolal@fb.com>, Shuah Khan <shuah@kernel.org>,
Willem de Bruijn <willemb@google.com>,
Jason Xing <kerneljasonxing@gmail.com>,
Anton Protopopov <aspsk@isovalent.com>,
Abhishek Chauhan <quic_abchauha@quicinc.com>,
Jordan Rome <linux@jordanrome.com>,
Martin Kelly <martin.kelly@crowdstrike.com>,
David Lechner <dlechner@baylibre.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf v2 2/2] selftests/bpf: add perf test for adjust_{head,meta}
Date: Wed, 2 Apr 2025 17:24:47 -0700 [thread overview]
Message-ID: <20250402172447.75ed447f@kernel.org> (raw)
In-Reply-To: <20250331032354.75808-3-jiayuan.chen@linux.dev>
On Mon, 31 Mar 2025 11:23:45 +0800 Jiayuan Chen wrote:
> which is negligible for the net stack.
>
> Before memset
> ./test_progs -a xdp_adjust_head_perf -v
> run adjust head with size 6 cost 56 ns
> run adjust head with size 20 cost 56 ns
> run adjust head with size 40 cost 56 ns
> run adjust head with size 200 cost 56 ns
>
> After memset
> ./test_progs -a xdp_adjust_head_perf -v
> run adjust head with size 6 cost 58 ns
> run adjust head with size 20 cost 58 ns
> run adjust head with size 40 cost 58 ns
> run adjust head with size 200 cost 66 ns
FWIW I'm not sure if this is "negligible" for XDP like you say,
but I defer to Jesper :)
next prev parent reply other threads:[~2025-04-03 0:24 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-31 3:23 [PATCH bpf v2 0/2] bpf, xdp: clean adjust_{head,meta} memory when offset < 0 Jiayuan Chen
2025-03-31 3:23 ` [PATCH bpf v2 1/2] bpf, xdp: clean head/meta when expanding it Jiayuan Chen
2025-04-03 8:17 ` Jesper Dangaard Brouer
2025-04-03 14:24 ` Alexei Starovoitov
2025-04-03 14:32 ` Willem de Bruijn
2025-04-04 0:28 ` Alexei Starovoitov
2025-04-04 0:27 ` Jiayuan Chen
2025-04-04 0:29 ` Alexei Starovoitov
2025-03-31 3:23 ` [PATCH bpf v2 2/2] selftests/bpf: add perf test for adjust_{head,meta} Jiayuan Chen
2025-04-03 0:24 ` Jakub Kicinski [this message]
2025-04-03 9:37 ` Jesper Dangaard Brouer
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