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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 :)

  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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