From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [PATCH net-2.6 1/2] [TCP]: Fix ratehalving with bidirectional flows Date: Tue, 31 Jul 2007 14:37:26 +0100 Message-ID: <20070731143726.3fecfe86@oldman.hamilton.local> References: <20070730.222112.41634340.davem@davemloft.net> <20070731105113.4730d9bb@oldman.hamilton.local> <20070731.025827.07638506.davem@davemloft.net> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary=MP_0GgvZqd1LgfkO8bQe_WrOcI Cc: ilpo.jarvinen@helsinki.fi, netdev@vger.kernel.org To: David Miller Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:60761 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759661AbXGaNiA (ORCPT ); Tue, 31 Jul 2007 09:38:00 -0400 In-Reply-To: <20070731.025827.07638506.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org --MP_0GgvZqd1LgfkO8bQe_WrOcI Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Content-Disposition: inline I noticed no difference in the two flow tests. That is not a bad thing, just that this test doesn't hit that code. The anomaly is that first flow does slow start then gets loss and ends up reducing it's window size all the way to the bottom, finally it recovers. This happens with Cubic, H-TCP and others as well; if the queue in the network is large enough, they don't handle the initial loss well. 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