linux-kernel - Re: [PATCH bpf-next] bpf: cpumap: Move xdp:xdp_cpumap

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Message-Id: 
 <172606622953.943906.17362698555849146465.git-patchwork-notify@kernel.org>
Date: Wed, 11 Sep 2024 14:50:29 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Daniel Xu <dxu@...uu.xyz>
Cc: davem@...emloft.net, ast@...nel.org, hawk@...nel.org, kuba@...nel.org,
 daniel@...earbox.net, john.fastabend@...il.com, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, netdev@...r.kernel.org,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org, lorenzo@...nel.org,
 aleksander.lobakin@...el.com, kernel-team@...a.com
Subject: Re: [PATCH bpf-next] bpf: cpumap: Move xdp:xdp_cpumap_kthread tracepoint
 before rcv

Hello:

This patch was applied to bpf/bpf-next.git (net)
by Daniel Borkmann <daniel@...earbox.net>:

On Thu,  5 Sep 2024 19:22:44 -0600 you wrote:
> cpumap takes RX processing out of softirq and onto a separate kthread.
> Since the kthread needs to be scheduled in order to run (versus softirq
> which does not), we can theoretically experience extra latency if the
> system is under load and the scheduler is being unfair to us.
> 
> Moving the tracepoint to before passing the skb list up the stack allows
> users to more accurately measure enqueue/dequeue latency introduced by
> cpumap via xdp:xdp_cpumap_enqueue and xdp:xdp_cpumap_kthread tracepoints.
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: cpumap: Move xdp:xdp_cpumap_kthread tracepoint before rcv
    https://git.kernel.org/bpf/bpf-next/c/23dc9867329c

You are awesome, thank you!
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