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Date: Wed, 09 Sep 2009 17:09:06 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Christoph Lameter <cl@...ux-foundation.org>
CC: netdev@...r.kernel.org
Subject: Re: UDP regression with packets rates < 10k per sec
Christoph Lameter a écrit :
> On Wed, 9 Sep 2009, Eric Dumazet wrote:
>
>> In order to reproduce this here, could you tell me if you use
>>
>> Producer linux-2.6.22 -> Receiver 2.6.22
>> Producer linux-2.6.31 -> Receiver 2.6.31
>
> I use the above setup.
Then frames are sent on wire but not received
(they are received via mc loop, internal stack magic)
# ./mcast -L -n1 -r 10000
WARNING: Multiple active ethernet devices. Using local address 192.168.0.1
Receiver: Listening to control channel 239.0.192.1
Receiver: Subscribing to 1 MC addresses 239.0.192-254.2-254 offset 0 origin 192.168.0.1
Sender: Sending 10000 msgs/ch/sec on 1 channels. Probe interval=0.001-1 sec.
TotalMsg Lost SeqErr TXDrop Msg/Sec KB/Sec Min/us Avg/us Max/us StdDv
100000 0 0 0 10000 3000.0 7.84 8.89 10.51 0.66
# uname -a
Linux erd 2.6.30.5 #2 SMP Mon Sep 7 17:15:43 CEST 2009 i686 i686 i386 GNU/Linux
I tried an old kernel on same hardware :
# ./mcast -L -n1 -r 10000
WARNING: Multiple active ethernet devices. Using local address 55.225.18.6
Receiver: Listening to control channel 239.0.192.1
Receiver: Subscribing to 1 MC addresses 239.0.192-254.2-254 offset 0 origin 55.225.18.6
Sender: Sending 10000 msgs/ch/sec on 1 channels. Probe interval=0.001-1 sec.
TotalMsg Lost SeqErr TXDrop Msg/Sec KB/Sec Min/us Avg/us Max/us StdDv
99999 0 0 0 9998 0.0 9.00 9.95 14.50 1.56
Linux erd 2.6.9-55.ELsmp #1 SMP Fri Apr 20 17:03:35 EDT 2007 i686 i686 i386 GNU/Linux
So my numbers seem much better than yours...
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