From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarek Poplawski Subject: Re: Strange TCP behavior over HSDPA Date: Tue, 29 Dec 2009 10:57:48 +0000 Message-ID: <20091229105748.GB7209@ff.dom.local> References: <20091229083050.GA7209@ff.dom.local> <4B39D30F.8090006@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Kristian Evensen Return-path: Received: from fg-out-1718.google.com ([72.14.220.158]:45369 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752683AbZL2K54 (ORCPT ); Tue, 29 Dec 2009 05:57:56 -0500 Received: by fg-out-1718.google.com with SMTP id 19so4701681fgg.1 for ; Tue, 29 Dec 2009 02:57:55 -0800 (PST) Content-Disposition: inline In-Reply-To: <4B39D30F.8090006@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: 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.