linux-kernel - Re: [PATCH] net: af_packet: add af

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Message-ID: <2fb8917d59b22dd78fe1ff216157eea7128e5990.camel@fejes.dev>
Date: Wed, 06 Aug 2025 09:24:57 +0200
From: Ferenc Fejes <ferenc@...es.dev>
To: Xin Zhao <jackzxcui1989@....com>, willemdebruijn.kernel@...il.com
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, 	horms@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: af_packet: add af_packet hrtimer mode

On Wed, 2025-08-06 at 13:52 +0800, Xin Zhao wrote:
> In a system with high real-time requirements, the timeout mechanism of
> ordinary timers with jiffies granularity is insufficient to meet the
> demands for real-time performance. Meanwhile, the optimization of CPU
> usage with af_packet is quite significant. Add hrtimer mode to help
> compensate for the shortcomings in real-time performance.

Do you have performance numbers? It would be nice to see the test environment,
measurements carried out and some latency/jitter numbers.

Thanks,
Ferenc