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

Eric Dumazet
2012-02-16T21:59:40Z

Le jeudi 16 février 2012 à 23:49 +0200, alekcejk@googlemail.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@googlemail.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