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

alekcejk
2012-02-16T22:09:06Z

В сообщении от Четверг 16 февраля 2012 22:59:33 вы написали:
> 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 ?

Yes.

> try 1, -1 or -2

With 1 and -1 maximum speed increased to 6,99 M/s, with -2 decreased to 3,3 M/s.