From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH v4 3/3] tcp: early retransmit: delayed fast retransmit Date: Wed, 02 May 2012 20:56:37 -0400 (EDT) Message-ID: <20120502.205637.19625325390404925.davem@davemloft.net> References: <1336001404-21879-1-git-send-email-ycheng@google.com> <1336001404-21879-3-git-send-email-ycheng@google.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: ilpo.jarvinen@helsinki.fi, ncardwell@google.com, nanditad@google.com, netdev@vger.kernel.org To: ycheng@google.com Return-path: Received: from shards.monkeyblade.net ([198.137.202.13]:38201 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754802Ab2ECA4r (ORCPT ); Wed, 2 May 2012 20:56:47 -0400 In-Reply-To: <1336001404-21879-3-git-send-email-ycheng@google.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Yuchung Cheng Date: Wed, 2 May 2012 16:30:04 -0700 > Implementing the advanced early retransmit (sysctl_tcp_early_retrans==2). > Delays the fast retransmit by an interval of RTT/4. We borrow the > RTO timer to implement the delay. If we receive another ACK or send > a new packet, the timer is cancelled and restored to original RTO > value offset by time elapsed. When the delayed-ER timer fires, > we enter fast recovery and perform fast retransmit. > > Signed-off-by: Yuchung Cheng Applied.