linux-kernel - Re: -27% netperf TCP_STREAM regression by "tcp_memcontrol: Kill struct tcp

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Message-Id: <20131022.180023.1141845387743361648.davem@davemloft.net>
Date:	Tue, 22 Oct 2013 18:00:23 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fengguang.wu@...el.com
Cc:	ebiederm@...ssion.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: -27% netperf TCP_STREAM regression by "tcp_memcontrol: Kill
 struct tcp_memcontrol"

From: fengguang.wu@...el.com
Date: Tue, 22 Oct 2013 22:41:29 +0100

> We noticed big netperf throughput regressions
> 
>     a4fe34bf902b8f709c63      2e685cad57906e19add7  
> ------------------------  ------------------------  
>                   707.40       -40.7%       419.60  lkp-nex04/micro/netperf/120s-200%-TCP_STREAM
>                  2775.60       -23.7%      2116.40  lkp-sb03/micro/netperf/120s-200%-TCP_STREAM
>                  3483.00       -27.2%      2536.00  TOTAL netperf.Throughput_Mbps
> 
> and bisected it to
> 
> commit 2e685cad57906e19add7189b5ff49dfb6aaa21d3
> Author: Eric W. Biederman <ebiederm@...ssion.com>
> Date:   Sat Oct 19 16:26:19 2013 -0700
> 
>     tcp_memcontrol: Kill struct tcp_memcontrol

Eric please look into this, I'd rather have a fix to apply than revert your
work.

Thanks.
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