netdev - Re: Re: Re: limited network bandwidth with 3.2.x kernels

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Date:	Thu, 16 Feb 2012 22:59:33 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	alekcejk@...glemail.com
Cc:	Neal Cardwell <ncardwell@...gle.com>, netdev@...r.kernel.org
Subject: Re: Re: Re: limited network bandwidth with 3.2.x kernels

Le jeudi 16 février 2012 à 23:49 +0200, alekcejk@...glemail.com a
écrit :
> В сообщении от Четверг 16 февраля 2012 13:19:58 вы написали:
> > On Thu, Feb 16, 2012 at 12:54 PM,  <alekcejk@...glemail.com> wrote:
> > I still think it would be useful to have these three pieces of data
> > for a slow/3.2.x transfer (from a geographically distant server) if
> > you have a sec:
> > 
> > - tcpdump of first 300 or so packets to see SYN/SYNACK options and RTT
> 

> > - summary of overall throughput wget sees on that transfer
> 
> --2012-02-16 23:33:30--  http://speedtest.tele2.net/1GB.zip
> 100%[===========================>] 1 073 741 824 5,02M/s   in 3m 29s
> 2012-02-16 23:36:59 (4,90 MB/s) - «/dev/null» saved [1073741824/1073741824]
> 
> > This should help establish whether the receiver window is really the
> > limiting factor in the slow cases.
> > 

Is tweaking /proc/sys/net/ipv4/tcp_adv_win_scale changes the numbers ?

try 1, -1 or -2



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