netdev - Re: [PATCH bpf-next V2] bpf/xdp: optimize bpf_xdp

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Date: Mon, 05 Jun 2023 20:50:20 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jesper Dangaard Brouer <brouer@...hat.com>
Cc: ttoukan.linux@...il.com, borkmann@...earbox.net, ast@...nel.org,
 andrii.nakryiko@...il.com, bpf@...r.kernel.org, tariqt@...dia.com,
 gal@...dia.com, lorenzo@...nel.org, netdev@...r.kernel.org,
 echaudro@...hat.com, andrew.gospodarek@...adcom.com
Subject: Re: [PATCH bpf-next V2] bpf/xdp: optimize bpf_xdp_pointer to avoid
 reading sinfo

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Thu, 01 Jun 2023 18:21:54 +0200 you wrote:
> Currently we observed a significant performance degradation in
> samples/bpf xdp1 and xdp2, due XDP multibuffer "xdp.frags" handling,
> added in commit 772251742262 ("samples/bpf: fixup some tools to be able
> to support xdp multibuffer").
> 
> This patch reduce the overhead by avoiding to read/load shared_info
> (sinfo) memory area, when XDP packet don't have any frags. This improves
> performance because sinfo is located in another cacheline.
> 
> [...]

Here is the summary with links:
  - [bpf-next,V2] bpf/xdp: optimize bpf_xdp_pointer to avoid reading sinfo
    https://git.kernel.org/bpf/bpf-next/c/411486626e57

You are awesome, thank you!
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