From: Kristian Evensen <kristian.evensen@gmail.com>
To: Jarek Poplawski <jarkao2@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: Strange TCP behavior over HSDPA
Date: Tue, 29 Dec 2009 10:59:43 +0100 [thread overview]
Message-ID: <4B39D30F.8090006@gmail.com> (raw)
In-Reply-To: <20091229083050.GA7209@ff.dom.local>
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.
After finally getting hold of someone I know at my ISP, I was told that
they use TCP accelerators in their mobile network. Also, when looking at
the packet captures from the server side I see that the sequene numbers
are changed, so there is a machine doing something to the packets along
the route. What I suspect is that this or these machines somehow breaks
when a retransmission occurs. I am not quire sure what could cause it
though, for example all dupAcks generated by the client are recieved by
the server, but hopefully my ISP will be able to figure it out.
-Kristian
next prev parent reply other threads:[~2009-12-29 10:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-28 12:56 Strange TCP behavior over HSDPA Kristian Evensen
2009-12-29 8:30 ` Jarek Poplawski
2009-12-29 9:59 ` Kristian Evensen [this message]
2009-12-29 10:57 ` Jarek Poplawski
2009-12-29 12:16 ` Jarek Poplawski
2009-12-29 13:36 ` Jarek Poplawski
2009-12-29 14:30 ` Kristian Evensen
2009-12-29 18:31 ` Jarek Poplawski
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