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Message-ID: <1342050592.3265.8195.camel@edumazet-glaptop> Date: Thu, 12 Jul 2012 01:49:52 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Rick Jones <rick.jones2@...com> Cc: David Miller <davem@...emloft.net>, ycheng@...gle.com, dave.taht@...il.com, netdev@...r.kernel.org, codel@...ts.bufferbloat.net, therbert@...gle.com, mattmathis@...gle.com, nanditad@...gle.com, ncardwell@...gle.com, andrewmcgr@...il.com Subject: Re: [RFC PATCH v2] tcp: TCP Small Queues On Wed, 2012-07-11 at 11:44 -0700, Rick Jones wrote: > On 07/11/2012 08:11 AM, Eric Dumazet wrote: > > > > Some bench results about the choice of 128KB being the default value: > > What were the starting/baseline figures? > > > > > Tests using a single TCP flow. > > > > Tests on 10Gbit links : > > > > > > echo 16384 >/proc/sys/net/ipv4/tcp_limit_output_bytes > > OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.99.2 (192.168.99.2) port 0 AF_INET > > tcpi_rto 201000 tcpi_ato 0 tcpi_pmtu 1500 tcpi_rcv_ssthresh 14600 > > tcpi_rtt 1875 tcpi_rttvar 750 tcpi_snd_ssthresh 16 tpci_snd_cwnd 79 > > tcpi_reordering 53 tcpi_total_retrans 0 > > Local Local Local Elapsed Throughput Throughput Local Local Remote Remote Local Remote Service > > Send Socket Send Socket Send Time Units CPU CPU CPU CPU Service Service Demand > > Size Size Size (sec) Util Util Util Util Demand Demand Units > > Final Final % Method % Method > > 392360 392360 16384 20.00 1389.53 10^6bits/s 0.52 S 4.30 S 0.737 1.014 usec/KB > > By the way, that double reporting of the local socket send size is fixed in: > > ------------------------------------------------------------------------ > r516 | raj | 2012-01-05 15:48:52 -0800 (Thu, 05 Jan 2012) | 1 line > > report the rsr_size_end in an omni stream test rather than a copy of the > lss_size_end > > of netperf and later. Also, any idea why the local socket send size got > so much larger with 1GbE than 10 GbE at that setting of > tcp_limit_output_bytes? The 10Gb receiver is a net-next kernel, but the 1Gb receiver is a 2.6.38 ubuntu kernel. They probably have very different TCP behavior. -- 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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