From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH 0/2 net-next] tcp: reducing lost retransmits in recovery Date: Wed, 08 Jul 2015 13:30:03 -0700 (PDT) Message-ID: <20150708.133003.612921512265899727.davem@davemloft.net> References: <1435785075-20600-1-git-send-email-ycheng@google.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: ycheng@google.com Return-path: Received: from shards.monkeyblade.net ([149.20.54.216]:37227 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755142AbbGHUaG (ORCPT ); Wed, 8 Jul 2015 16:30:06 -0400 In-Reply-To: <1435785075-20600-1-git-send-email-ycheng@google.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Yuchung Cheng Date: Wed, 1 Jul 2015 14:11:13 -0700 > This patch series reduces lost retransmits in recovery, in particular > when dealing with traffic policers. The main problem is that > slow start in recovery under policing can cause massive lost and > retransmit storms: any excess sending rate turns into drops. The > solution is to avoid doing slow start when lost retransmit is > detected and use packet conservation instead. > > On networks with traffic policers the patches have lowered the > TCP loss rates by ~20% from Google servers without latency regressions. Looks great, series applied to net-next.