netdev - Re: Poor network performance x86

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Message-ID: <1391969674.10160.134.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 09 Feb 2014 10:14:34 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Daniel Exner <dex@...gonslave.de>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Poor network performance x86_64.. also with 3.13

On Sun, 2014-02-09 at 16:31 +0100, Borislav Petkov wrote:
> On Sun, Feb 09, 2014 at 04:05:11PM +0100, Daniel Exner wrote:
> > > cat /etc/sysctl.d/net.conf
> > > net.ipv4.tcp_window_scaling = 1
> > > net.core.rmem_max = 16777216
> > > net.ipv4.tcp_rmem = 4096 87380 16777
> > > net.ipv4.tcp_wmem = 4096       1638
> > 
> > After removing those values I finally had sane iperf values.
> > No idea how those got there, perhaps they made sense when I first setup
> > the box, which is some years ago..
> 
> The only question that is left to clarify now is why do those values
> have effect on 3.12.x and not on 3.10...

tcp_rmem[2] = 16777

Come on, the 640KB barrier was broken a long time ago ;)

Feel free to investigate, I wont ;)



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