linux-kernel - Re: [PATCH v2 3/5] mm: memcg: make stats flushing threshold per-memcg

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Date:   Tue, 10 Oct 2023 18:48:11 -0700
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Muchun Song <muchun.song@...ux.dev>,
        Ivan Babrou <ivan@...udflare.com>, Tejun Heo <tj@...nel.org>,
        Michal Koutný <mkoutny@...e.com>,
        Waiman Long <longman@...hat.com>, kernel-team@...udflare.com,
        Wei Xu <weixugc@...gle.com>, Greg Thelen <gthelen@...gle.com>,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] mm: memcg: make stats flushing threshold per-memcg

On Tue, Oct 10, 2023 at 5:36 PM Shakeel Butt <shakeelb@...gle.com> wrote:
>
> On Tue, Oct 10, 2023 at 03:21:47PM -0700, Yosry Ahmed wrote:
> [...]
> >
> > I tried this on a machine with 72 cpus (also ixion), running both
> > netserver and netperf in /sys/fs/cgroup/a/b/c/d as follows:
> > # echo "+memory" > /sys/fs/cgroup/cgroup.subtree_control
> > # mkdir /sys/fs/cgroup/a
> > # echo "+memory" > /sys/fs/cgroup/a/cgroup.subtree_control
> > # mkdir /sys/fs/cgroup/a/b
> > # echo "+memory" > /sys/fs/cgroup/a/b/cgroup.subtree_control
> > # mkdir /sys/fs/cgroup/a/b/c
> > # echo "+memory" > /sys/fs/cgroup/a/b/c/cgroup.subtree_control
> > # mkdir /sys/fs/cgroup/a/b/c/d
> > # echo 0 > /sys/fs/cgroup/a/b/c/d/cgroup.procs
> > # ./netserver -6
> >
> > # echo 0 > /sys/fs/cgroup/a/b/c/d/cgroup.procs
> > # for i in $(seq 10); do ./netperf -6 -H ::1 -l 60 -t TCP_SENDFILE --
> > -m 10K; done
>
> You are missing '&' at the end. Use something like below:
>
> #!/bin/bash
> for i in {1..22}
> do
>    /data/tmp/netperf -6 -H ::1 -l 60 -t TCP_SENDFILE -- -m 10K &
> done
> wait
>

Oh sorry I missed the fact that you are running instances in parallel, my bad.

So I ran 36 instances on a machine with 72 cpus. I did this 10 times
and got an average from all instances for all runs to reduce noise:

#!/bin/bash

ITER=10
NR_INSTANCES=36

for i in $(seq $ITER); do
  echo "iteration $i"
  for j in $(seq $NR_INSTANCES); do
    echo "iteration $i" >> "out$j"
    ./netperf -6 -H ::1 -l 60 -t TCP_SENDFILE -- -m 10K >> "out$j" &
  done
  wait
done

cat out* | grep 540000 | awk '{sum += $5} END {print sum/NR}'

Base: 22169 mbps
Patched: 21331.9 mbps

The difference is ~3.7% in my runs. I am not sure what's different.
Perhaps it's the number of runs?