linux-kernel - Re: [GIT PULL v2] Networking for 6.7

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Message-ID: <CAADnVQJnMQaFoWxj165GZ+CwJbVtPQBss80o7zYVQwg5MVij3g@mail.gmail.com>
Date:   Thu, 9 Nov 2023 08:01:39 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Hou Tao <houtao1@...wei.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        Alexei Starovoitov <ast@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [GIT PULL v2] Networking for 6.7

On Thu, Nov 9, 2023 at 7:49 AM Kirill A. Shutemov <kirill@...temov.name> wrote:
>
> On Tue, Oct 31, 2023 at 02:09:48PM -0700, Jakub Kicinski wrote:
> >       bpf: Add support for non-fix-size percpu mem allocation
>
> Recent changes in BPF increased per-CPU memory consumption a lot.
>
> On virtual machine with 288 CPUs, per-CPU consumtion increased from 111 MB
> to 969 MB, or 8.7x.
>
> I've bisected it to the commit 41a5db8d8161 ("bpf: Add support for
> non-fix-size percpu mem allocation"), which part of the pull request.

Hmm. This is unexpected. Thank you for reporting.

How did you measure this 111 MB vs 969 MB ?
Pls share the steps to reproduce.

Yonghong, Hou,

please take a look as well.