linux-kernel - Re: [net] 4890b686f4: netperf.Throughput

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Message-ID: <CANn89i+gKtKsNT3SUJyOc8FiF4EO74Fando7GudeXw0+CPr=EQ@mail.gmail.com>
Date:   Mon, 27 Jun 2022 16:56:47 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Feng Tang <feng.tang@...el.com>, Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Muchun Song <songmuchun@...edance.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Xin Long <lucien.xin@...il.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        kernel test robot <oliver.sang@...el.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        network dev <netdev@...r.kernel.org>,
        linux-s390@...r.kernel.org, MPTCP Upstream <mptcp@...ts.linux.dev>,
        "linux-sctp @ vger . kernel . org" <linux-sctp@...r.kernel.org>,
        lkp@...ts.01.org, kbuild test robot <lkp@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Yin Fengwei <fengwei.yin@...el.com>, Ying Xu <yinxu@...hat.com>
Subject: Re: [net] 4890b686f4: netperf.Throughput_Mbps -69.4% regression

On Mon, Jun 27, 2022 at 4:53 PM Shakeel Butt <shakeelb@...gle.com> wrote:

> Am I understanding correctly that this 69.4% (or 73.7%) regression is
> with cgroup v2?
>
> Eric did the experiments on v2 but on real hardware where the
> performance impact was negligible.
>
> BTW do you see similar regression for tcp as well or just sctp?

TCP_RR with big packets can show a regression as well.

I gave this perf profile:

    28.69%  [kernel]       [k] copy_user_enhanced_fast_string
    16.13%  [kernel]       [k] intel_idle_irq
     6.46%  [kernel]       [k] page_counter_try_charge
     6.20%  [kernel]       [k] __sk_mem_reduce_allocated
     5.68%  [kernel]       [k] try_charge_memcg
     5.16%  [kernel]       [k] page_counter_cancel

And this points to false sharing on (struct page_counter *)->usage

I guess memcg had free lunch, because of per-socket cache, that we
need to remove.