linux-kernel - Re: [RFC v2 00/24] Per queue configs and large rx buffer support for zcrx

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Message-ID: <ul2vfq7upoqwoyop7mhznjmsjau7e4ei2t643gx7t7egoez3vn@lhnf5h2dpeb5>
Date: Wed, 13 Aug 2025 15:39:23 +0000
From: Dragos Tatulea <dtatulea@...dia.com>
To: Pavel Begunkov <asml.silence@...il.com>, 
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>, Paolo Abeni <pabeni@...hat.com>, andrew+netdev@...n.ch, 
	horms@...nel.org, davem@...emloft.net, sdf@...ichev.me, almasrymina@...gle.com, 
	dw@...idwei.uk, michael.chan@...adcom.com, ap420073@...il.com, 
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 00/24] Per queue configs and large rx buffer support for
 zcrx

Hi Pavel,

On Fri, Aug 08, 2025 at 03:54:23PM +0100, Pavel Begunkov wrote:
> [...] 
> For example, for 200Gbit broadcom NIC, 4K vs 32K buffers, and napi and
> userspace pinned to the same CPU:
> 
> packets=23987040 (MB=2745098), rps=199559 (MB/s=22837)
> CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
>   0    1.53    0.00   27.78    2.72    1.31   66.45    0.22
> packets=24078368 (MB=2755550), rps=200319 (MB/s=22924)
> CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
>   0    0.69    0.00    8.26   31.65    1.83   57.00    0.57
> 
> And for napi and userspace on different CPUs:
> 
> packets=10725082 (MB=1227388), rps=198285 (MB/s=22692)
> CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
>   0    0.10    0.00    0.50    0.00    0.50   74.50    24.40
>   1    4.51    0.00   44.33   47.22    2.08    1.85    0.00
> packets=14026235 (MB=1605175), rps=198388 (MB/s=22703)
> CPU    %usr   %nice    %sys %iowait    %irq   %soft   %idle
>   0    0.10    0.00    0.70    0.00    1.00   43.78   54.42
>   1    1.09    0.00   31.95   62.91    1.42    2.63    0.00
>
What did you use for this benchmark, send-zerocopy? Could you share a
branch and how you ran it please?

I have added some initial support to mlx5 for rx-buf-len and would like
to benchmark it and compare it to what you posted.

Thanks,
Dragos