linux-kernel - Re: [PATCH net-next 0/9] Split netmem from struct page

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Message-ID: <CAHS8izNiFA71bbLd1fq3sFh1CuC5Zh19f53XMPYk2Dj8iOfkOA@mail.gmail.com>
Date: Wed, 11 Jun 2025 13:48:36 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Byungchul Park <byungchul@...com>, willy@...radead.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, kernel_team@...ynix.com, 
	kuba@...nel.org, ilias.apalodimas@...aro.org, harry.yoo@...cle.com, 
	hawk@...nel.org, akpm@...ux-foundation.org, davem@...emloft.net, 
	john.fastabend@...il.com, andrew+netdev@...n.ch, toke@...hat.com, 
	tariqt@...dia.com, edumazet@...gle.com, pabeni@...hat.com, saeedm@...dia.com, 
	leon@...nel.org, ast@...nel.org, daniel@...earbox.net, david@...hat.com, 
	lorenzo.stoakes@...cle.com, Liam.Howlett@...cle.com, vbabka@...e.cz, 
	rppt@...nel.org, surenb@...gle.com, mhocko@...e.com, horms@...nel.org, 
	linux-rdma@...r.kernel.org, bpf@...r.kernel.org, vishal.moola@...il.com
Subject: Re: [PATCH net-next 0/9] Split netmem from struct page

On Wed, Jun 11, 2025 at 7:24 AM Pavel Begunkov <asml.silence@...il.com> wrote:
>
> On 6/9/25 05:32, Byungchul Park wrote:
> > Hi all,
> >
> > In this version, I'm posting non-controversial patches first.  I will
> > post the rest more carefully later.  In this version, no update has been
> > applied except excluding some patches from the previous version.  See
> > the changes below.
>
> fwiw, I tried it with net_iov (zcrx), it didn't blow up during a
> short test.
>

FWIW, I ran my devmem TCP tests, and pp benchmark regression tests.
Both look good to me. For the pp benchmark:

Before:

Fast path results:
no-softirq-page_pool01 Per elem: 11 cycles(tsc) 4.337 ns

ptr_ring results:
no-softirq-page_pool02 Per elem: 529 cycles(tsc) 196.073 ns

slow path results:
no-softirq-page_pool03 Per elem: 554 cycles(tsc) 205.195 ns

After:

Fast path results:
no-softirq-page_pool01 Per elem: 11 cycles(tsc) 4.401 ns

ptr_ring results:
no-softirq-page_pool02 Per elem: 530 cycles(tsc) 196.443 ns

slow path results:
no-softirq-page_pool03 Per elem: 551 cycles(tsc) 204.287 ns



-- 
Thanks,
Mina