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

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Message-ID: <20131023220743.GA5226@localhost>
Date:	Wed, 23 Oct 2013 23:07:43 +0100
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: -27% netperf TCP_STREAM regression by "tcp_memcontrol: Kill
 struct tcp_memcontrol"

> -       return !!sk->sk_prot->memory_pressure;
> +       return !!*sk->sk_prot->memory_pressure;

Good catch, Christoph! With no surprise, it restores the performance:

    a4fe34bf902b8f709c63      2e685cad57906e19add7      a235435d612680e595ea  
------------------------  ------------------------  ------------------------  
                  707.40       -41.0%       417.50        -8.8%       645.00  lkp-nex04/micro/netperf/120s-200%-TCP_STREAM
                 2775.60       -23.7%      2116.50        +2.1%      2834.00  lkp-sb03/micro/netperf/120s-200%-TCP_STREAM
                 3483.00       -27.2%      2534.00        -0.1%      3479.00  TOTAL netperf.Throughput_Mbps

It's a bit late, but

Tested-by: Fengguang Wu <fengguang.wu@...el.com>

Thanks,
Fengguang
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