netdev - Re: Linux TCP's Robustness to Multipath Packet Reordering

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Message-ID: <1303837801.3358.65.camel@edumazet-laptop>
Date:	Tue, 26 Apr 2011 19:10:01 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dominik Kaspar <dokaspar.ietf@...il.com>
Cc:	Carsten Wolff <carsten@...ffcarsten.de>, netdev@...r.kernel.org
Subject: Re: Linux TCP's Robustness to Multipath Packet Reordering

Le mardi 26 avril 2011 à 18:58 +0200, Dominik Kaspar a écrit :
> Hi Eric,
> 
> On Mon, Apr 25, 2011 at 5:38 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > Since you have at sender a rule to spoof destination address of packets,
> > you should make sure you dont send "super packets (up to 64Kbytes)",
> > because it would stress the multipath more than you wanted to. This way,
> > you send only normal packets (1500 MTU).
> >
> > ethtool -K eth0 tso off
> > ethtool -K eth0 gso off
> >
> > I am pretty sure it should help your (atypic) workload.
> 
> I made new experiments with the exact same multipath setup as before,
> but disabled TSO and GSO on all involved Ethernet interfaces. However,
> this did not seem to change much about TCP's behavior when packets are
> striped over heterogeneous paths. You can see the results of four
> 20-minute experiments on this plot:
> 
> http://home.simula.no/~kaspar/static/mptcp-emu-wlan-hspa-01-tos0.png
> 
> Cheers,
> Dominik

Hi Dominik

Any chance to have a pcap file from sender side, of say first 10.000
packets ?



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