linux-kernel - Re: [PATCH 3/3] memcg: increase MEMCG_CHARGE

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Message-ID: <CALvZod5YGVSTvsg25P6goqyGEY21eVnahsXcs2BGsp6OXxLwsg@mail.gmail.com>
Date:   Mon, 22 Aug 2022 08:09:01 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Muchun Song <songmuchun@...edance.com>,
        Michal Koutný <mkoutny@...e.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Feng Tang <feng.tang@...el.com>,
        Oliver Sang <oliver.sang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>, lkp@...ts.01.org,
        Cgroups <cgroups@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] memcg: increase MEMCG_CHARGE_BATCH to 64

On Mon, Aug 22, 2022 at 3:47 AM Michal Hocko <mhocko@...e.com> wrote:
>
[...]
>
> > To evaluate the impact of this optimization, on a 72 CPUs machine, we
> > ran the following workload in a three level of cgroup hierarchy with top
> > level having min and low setup appropriately. More specifically
> > memory.min equal to size of netperf binary and memory.low double of
> > that.
>
> a similar feedback to the test case description as with other patches.

What more info should I add to the description? Why did I set up min
and low or something else?

> >
> >  $ netserver -6
> >  # 36 instances of netperf with following params
> >  $ netperf -6 -H ::1 -l 60 -t TCP_SENDFILE -- -m 10K
> >
> > Results (average throughput of netperf):
> > Without (6.0-rc1)       10482.7 Mbps
> > With patch              17064.7 Mbps (62.7% improvement)
> >
> > With the patch, the throughput improved by 62.7%.
> >
> > Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> > Reported-by: kernel test robot <oliver.sang@...el.com>
>
> Anyway
> Acked-by: Michal Hocko <mhocko@...e.com>

Thanks