netdev - Re: Miscalculated TCP ACK ?

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Message-ID: <4E52F749.4000204@gmail.com>
Date:	Mon, 22 Aug 2011 19:41:45 -0500
From:	Gabriel Beddingfield <gabrbedd@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Miscalculated TCP ACK ?

On 08/22/2011 01:49 PM, Eric Dumazet wrote:
> Le lundi 22 août 2011 à 13:05 -0500, Gabriel Beddingfield a écrit :
>> On Mon, Aug 22, 2011 at 12:19 PM, Daniel Baluta<daniel.baluta@...il.com>  wrote:
>>>>> It appears to me that the ACK is off-by-one (should have been 27676).
>>>>> The server replies again with retransmissions.  This is with several
>>>>> kernel versions on local machines, ranging from 2.6.31 to 2.6.38.
>>>
>>>> Not a bug if frame carried a FIN
>>
>> The server packet had the FIN bit set.
>>
>
> then its fine.

Thank you!


>> I clipped the conversation to the vicinity of the problem.
>
> This sounds as a TSO bug, maybe driver/NIC related
>
> What is the NIC/driver used on your server ?

New news:  If I remove my router (Linksys WRTU54G-TM), the problem goes 
away.

Thank you guys for your helpful insights. :-)

-gabriel
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