From: Eric Dumazet <edumazet@google.com>
To: Shakeel Butt <shakeelb@google.com>
Cc: Feng Tang <feng.tang@intel.com>, Linux MM <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Michal Hocko <mhocko@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Muchun Song <songmuchun@bytedance.com>,
Jakub Kicinski <kuba@kernel.org>,
Xin Long <lucien.xin@gmail.com>,
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
kernel test robot <oliver.sang@intel.com>,
Soheil Hassas Yeganeh <soheil@google.com>,
LKML <linux-kernel@vger.kernel.org>,
network dev <netdev@vger.kernel.org>,
linux-s390@vger.kernel.org,
MPTCP Upstream <mptcp@lists.linux.dev>,
"linux-sctp @ vger . kernel . org" <linux-sctp@vger.kernel.org>,
lkp@lists.01.org, kbuild test robot <lkp@intel.com>,
Huang Ying <ying.huang@intel.com>,
Xing Zhengjun <zhengjun.xing@linux.intel.com>,
Yin Fengwei <fengwei.yin@intel.com>, Ying Xu <yinxu@redhat.com>
Subject: Re: [net] 4890b686f4: netperf.Throughput_Mbps -69.4% regression
Date: Mon, 27 Jun 2022 16:56:47 +0200 [thread overview]
Message-ID: <CANn89i+gKtKsNT3SUJyOc8FiF4EO74Fando7GudeXw0+CPr=EQ@mail.gmail.com> (raw)
In-Reply-To: <CALvZod7i_=7bNZR-LAXBPXJFxj-1KBuYs+rmG0iABAE1T90BPg@mail.gmail.com>
On Mon, Jun 27, 2022 at 4:53 PM Shakeel Butt <shakeelb@google.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.
next prev parent reply other threads:[~2022-06-27 14:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-19 15:04 [net] 4890b686f4: netperf.Throughput_Mbps -69.4% regression kernel test robot
2022-06-23 0:28 ` Jakub Kicinski
2022-06-23 3:08 ` Xin Long
2022-06-23 22:50 ` Xin Long
2022-06-24 1:57 ` Jakub Kicinski
2022-06-24 4:13 ` Eric Dumazet
2022-06-24 4:22 ` Eric Dumazet
2022-06-24 5:13 ` Feng Tang
2022-06-24 5:45 ` Eric Dumazet
2022-06-24 6:00 ` Feng Tang
2022-06-24 6:07 ` Eric Dumazet
2022-06-24 6:34 ` Shakeel Butt
2022-06-24 7:06 ` Feng Tang
2022-06-24 14:43 ` Shakeel Butt
2022-06-25 2:36 ` Feng Tang
2022-06-27 2:38 ` Feng Tang
2022-06-27 8:46 ` Eric Dumazet
2022-06-27 12:34 ` Feng Tang
2022-06-27 14:07 ` Eric Dumazet
2022-06-27 14:48 ` Feng Tang
2022-06-27 16:25 ` Eric Dumazet
2022-06-27 16:48 ` Shakeel Butt
2022-06-27 17:05 ` Eric Dumazet
2022-06-28 1:46 ` Roman Gushchin
2022-06-28 3:49 ` Feng Tang
2022-07-01 15:47 ` Shakeel Butt
2022-07-03 10:43 ` Feng Tang
2022-07-03 22:55 ` Roman Gushchin
2022-07-05 5:03 ` Feng Tang
2022-08-16 5:52 ` Oliver Sang
2022-08-16 15:55 ` Shakeel Butt
2022-06-27 14:52 ` Shakeel Butt
2022-06-27 14:56 ` Eric Dumazet [this message]
2022-06-27 15:12 ` Feng Tang
2022-06-27 16:25 ` Shakeel Butt
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