From: Dominik Kaspar <dokaspar.ietf@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Carsten Wolff <carsten@wolffcarsten.de>, netdev@vger.kernel.org
Subject: Re: Linux TCP's Robustness to Multipath Packet Reordering
Date: Tue, 26 Apr 2011 20:00:11 +0200 [thread overview]
Message-ID: <BANLkTikjcd6ZAF5wH_8CKA_OCrfprGokmw@mail.gmail.com> (raw)
In-Reply-To: <1303837801.3358.65.camel@edumazet-laptop>
Hi Eric,
Here are the tcpdump files for the first TSO-disabled experiment, in a
full version and a short version with only the first 10000 packets:
http://home.simula.no/~kaspar/static/mptcp-emu-wlan-hspa-01-tos0-exp1-full.pcap
http://home.simula.no/~kaspar/static/mptcp-emu-wlan-hspa-01-tos0-exp1-short.pcap
By the way, the packets are sent from the server (x.x.x.189) to the
client interfaces (x.x.x.74) and (x.x.x.216) with the following
pattern (which is a non-bursty 128-bit approximation of scheduling
with a 600:400 ratio over primary path 0 and secondary path 1):
0010010100101001010010100101001010010100101001010010100101001010
0101001010010100101001010010100101001010010100101001010010100101
Greetings,
Dominik
On Tue, Apr 26, 2011 at 7:10 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> 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@gmail.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 ?
>
>
>
>
next prev parent reply other threads:[~2011-04-26 18:00 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-25 10:37 Linux TCP's Robustness to Multipath Packet Reordering Dominik Kaspar
2011-04-25 11:25 ` Eric Dumazet
2011-04-25 14:35 ` Dominik Kaspar
2011-04-25 15:38 ` Eric Dumazet
2011-04-26 16:58 ` Dominik Kaspar
2011-04-26 17:10 ` Eric Dumazet
2011-04-26 18:00 ` Dominik Kaspar [this message]
2011-04-26 20:16 ` John Heffner
2011-04-26 21:27 ` Dominik Kaspar
2011-04-27 9:57 ` Carsten Wolff
2011-04-27 16:22 ` Dominik Kaspar
2011-04-27 16:36 ` Alexander Zimmermann
2011-06-21 11:25 ` Ilpo Järvinen
2011-06-21 11:34 ` Carsten Wolff
2011-06-21 11:46 ` Ilpo Järvinen
2011-04-27 16:48 ` Eric Dumazet
2011-04-27 17:39 ` Yuchung Cheng
2011-04-27 17:53 ` Alexander Zimmermann
2011-04-27 19:56 ` Dominik Kaspar
2011-04-27 21:41 ` Yuchung Cheng
2011-04-28 6:11 ` Alexander Zimmermann
2011-06-19 15:22 ` Dominik Kaspar
2011-06-19 15:38 ` Alexander Zimmermann
2011-06-19 16:25 ` Dominik Kaspar
2011-06-20 10:42 ` Ilpo Järvinen
2011-06-20 12:52 ` Dominik Kaspar
2011-06-21 11:35 ` Ilpo Järvinen
2011-04-26 20:43 ` Eric Dumazet
2011-04-26 21:04 ` Dominik Kaspar
2011-04-26 21:08 ` Eric Dumazet
2011-04-26 21:16 ` Dominik Kaspar
2011-04-26 21:17 ` Eric Dumazet
2011-04-25 12:59 ` Carsten Wolff
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