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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1329429573.5450.2.camel@edumazet-laptop>
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



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html