linux-kernel - Re: [PATCH RFC net-next v1] page_pool: import Jesper's page

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Message-ID: <CAHS8izM30jZ+bKkpeKQLKk3BGj8nBFLpUFgS2qM7x8EPMV7KOQ@mail.gmail.com>
Date: Mon, 24 Mar 2025 13:23:16 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Toke Høiland-Jørgensen <toke@...e.dk>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Jesper Dangaard Brouer <hawk@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Ilias Apalodimas <ilias.apalodimas@...aro.org>, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH RFC net-next v1] page_pool: import Jesper's page_pool benchmark

On Mon, Mar 10, 2025 at 2:15 AM Toke Høiland-Jørgensen <toke@...e.dk> wrote:
>
> Mina Almasry <almasrymina@...gle.com> writes:
>
> > From: Jesper Dangaard Brouer <hawk@...nel.org>
> >
> > We frequently consult with Jesper's out-of-tree page_pool benchmark to
> > evaluate page_pool changes.
> >
> > Consider importing the benchmark into the upstream linux kernel tree so
> > that (a) we're all running the same version, (b) pave the way for shared
> > improvements, and (c) maybe one day integrate it with nipa, if possible.
> >
> > I imported the bench_page_pool_simple from commit 35b1716d0c30 ("Add
> > page_bench06_walk_all"), from this repository:
> > https://github.com/netoptimizer/prototype-kernel.git
> >
> > I imported the benchmark, largely as-is. I only fixed build or
> > checkpatch issues.
> >
> > Cc: Jesper Dangaard Brouer <hawk@...nel.org>
> > Cc: Ilias Apalodimas <ilias.apalodimas@...aro.org>
> > Cc: Jakub Kicinski <kuba@...nel.org>
> > Cc: Toke Høiland-Jørgensen <toke@...e.dk>
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Mina Almasry <almasrymina@...gle.com>
> >
> > ---
> >
> > RFC discussion points:
> > - Desirable to import it?
>
> I think so, yeah.
>
> > - Can the benchmark be imported as-is for an initial version? Or needs
> >   lots of modifications?
>
> One thing that I was discussing with Jesper the other day is that the
> current version allocates the page_pool itself in softirq context, which
> leads to some "may sleep" warning. I think we should fix that before
> upstreaming.
>

I don't think I saw that warning for whatever reason. Do you by any
chance have a fix that I can squash? Or do you think it is very
critical to fix this before upstreaming? I.e. not follow up with a
fix?


-- 
Thanks,
Mina