From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: Re: [RFC PATCH net-next 3/3] packet: make use of deferred TX queue flushing Date: Mon, 25 Aug 2014 15:54:02 +0200 Message-ID: <20140825155402.2f2a03d7@redhat.com> References: <1408887738-7661-1-git-send-email-dborkman@redhat.com> <1408887738-7661-4-git-send-email-dborkman@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: brouer@redhat.com, davem@davemloft.net, netdev@vger.kernel.org To: Daniel Borkmann Return-path: Received: from mx1.redhat.com ([209.132.183.28]:21631 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932406AbaHYNyH (ORCPT ); Mon, 25 Aug 2014 09:54:07 -0400 In-Reply-To: <1408887738-7661-4-git-send-email-dborkman@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: On Sun, 24 Aug 2014 15:42:18 +0200 Daniel Borkmann wrote: > This adds a first use-case of deferred tail pointer flushing > for AF_PACKET's TX_RING in QDISC_BYPASS mode. Testing with trafgen. I've updated patch 1/3 to NOT call mmiowb(), during this testing, see why in my other post. trafgen cmdline: trafgen --cpp --dev eth5 --conf udp_example01.trafgen -V --cpus 1 * Only use 1 CPU * default is mmap * default is QDISC_BYPASS mode BASELINE(no-patches): trafgen QDISC_BYPASS and mmap: - tx:1562539 pps With PACKET_FLUSH_THRESH=8, and QDISC_BYPASS and mmap: - tx:1683746 pps Improvement: + 121207 pps - 46 ns (1/1562539*10^9)-(1/1683746*10^9) This is a significant improvement! :-) -- Best regards, Jesper Dangaard Brouer MSc.CS, Sr. Network Kernel Developer at Red Hat Author of http://www.iptv-analyzer.org LinkedIn: http://www.linkedin.com/in/brouer Setup details: -------------- Network overload testing setup according to: http://netoptimizer.blogspot.dk/2014/04/basic-tuning-for-network-overload.html Trafgen input file: https://github.com/netoptimizer/network-testing/blob/master/trafgen/udp_example01.trafgen Driver/NIC: ixgbe CPU: E5-2695v2(ES)