netdev - Re: UDP regression with packets rates

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Date:	Wed, 09 Sep 2009 19:08:10 +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:
> 
>> Christoph Lameter a ?crit :
>>> 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)
> 
> We are talking about two machines running 2.6.22 or 2.6.31. There is no
> magic mc loop between the two machines. -L was not used.
> 


I have no idea how you run the test then, and how are computed time deltas.

Are you clocks synchronized to less than one us ? How is it done ?
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