netdev - Re: Strange TCP behavior over HSDPA

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Message-ID: <20091229105748.GB7209@ff.dom.local>
Date:	Tue, 29 Dec 2009 10:57:48 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Kristian Evensen <kristian.evensen@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Strange TCP behavior over HSDPA

On Tue, Dec 29, 2009 at 10:59:43AM +0100, Kristian Evensen wrote:
> Den 29.12.2009 09:30, skrev Jarek Poplawski:
>> The most obvious difference seems to be the SACK option used in [2],
>> so maybe something on the route breaks it (without tunnels).
>>
>> Jarek P.
>>    
> Thank you for your reply. I have tried disabling SACK and then the  
> performance when packet loss occured got even worse, and the rest of the  
> time it was pretty similar.

Did you try to turn off TCP window scaling btw? Anyway, under the
tunnel ([2]), when SACK worked, it saved you a lot of retransmits.

Jarek P.
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