From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Jones Subject: Re: [PATCH net-next] cxgb4: Add low latency socket busy_poll support Date: Tue, 03 Feb 2015 08:45:53 -0800 Message-ID: <54D0FB41.1030802@hp.com> References: <1422940816-27402-1-git-send-email-hariprasad@chelsio.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: davem@davemloft.net, leedom@chelsio.com, anish@chelsio.com, nirranjan@chelsio.com, praveenm@chelsio.com, kumaras@chelsio.com To: Hariprasad Shenai , netdev@vger.kernel.org Return-path: Received: from g4t3426.houston.hp.com ([15.201.208.54]:37626 "EHLO g4t3426.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754570AbbBCQpz (ORCPT ); Tue, 3 Feb 2015 11:45:55 -0500 In-Reply-To: <1422940816-27402-1-git-send-email-hariprasad@chelsio.com> Sender: netdev-owner@vger.kernel.org List-ID: On 02/02/2015 09:20 PM, Hariprasad Shenai wrote: > cxgb_busy_poll, corresponding to ndo_busy_poll, gets called by the socket > waiting for data. > > With busy_poll enabled, improvement is seen in latency numbers as observed by > collecting netperf TCP_RR numbers. Which, not surprisingly, leads to the question - how much improvement? :) Extra credit for including the change in netperf-reported service demands. happy benchmarking, rick jones