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

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Message-Id: <20220624144358.lqt2ffjdry6p5u4d@google.com>
Date:   Fri, 24 Jun 2022 14:43:58 +0000
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Feng Tang <feng.tang@...el.com>
Cc:     Eric Dumazet <edumazet@...gle.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 Fri, Jun 24, 2022 at 03:06:56PM +0800, Feng Tang wrote:
> On Thu, Jun 23, 2022 at 11:34:15PM -0700, Shakeel Butt wrote:
[...]
> > 
> > Feng, can you please explain the memcg setup on these test machines
> > and if the tests are run in root or non-root memcg?
> 
> I don't know the exact setup, Philip/Oliver from 0Day can correct me.
> 
> I logged into a test box which runs netperf test, and it seems to be
> cgoup v1 and non-root memcg. The netperf tasks all sit in dir:
> '/sys/fs/cgroup/memory/system.slice/lkp-bootstrap.service'
> 

Thanks Feng. Can you check the value of memory.kmem.tcp.max_usage_in_bytes
in /sys/fs/cgroup/memory/system.slice/lkp-bootstrap.service after making
sure that the netperf test has already run?

If this is non-zero then network memory accounting is enabled and the
slowdown is expected.

> And the rootfs is a debian based rootfs
> 
> Thanks,
> Feng
> 
> 
> > thanks,
> > Shakeel