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Message-ID: <20140825155402.2f2a03d7@redhat.com> Date: Mon, 25 Aug 2014 15:54:02 +0200 From: Jesper Dangaard Brouer <brouer@...hat.com> To: Daniel Borkmann <dborkman@...hat.com> Cc: brouer@...hat.com, davem@...emloft.net, netdev@...r.kernel.org Subject: Re: [RFC PATCH net-next 3/3] packet: make use of deferred TX queue flushing On Sun, 24 Aug 2014 15:42:18 +0200 Daniel Borkmann <dborkman@...hat.com> 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) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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