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Date: Mon, 25 May 2015 13:42:59 -0700 From: Eric Dumazet <eric.dumazet@...il.com> To: "John A. Sullivan III" <jsullivan@...nsourcedevel.com> Cc: netdev@...r.kernel.org Subject: Re: TCP window auto-tuning sub-optimal in GRE tunnel On Mon, 2015-05-25 at 13:41 -0700, Eric Dumazet wrote: > lpaa23:~# DUMP_TCP_INFO=1 ./netperf -H 10.7.8.152 -Cc -t OMNI -l 20 > OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.7.8.152 () port 0 AF_INET > tcpi_rto 281000 tcpi_ato 0 tcpi_pmtu 1476 tcpi_rcv_ssthresh 28720 > tcpi_rtt 80431 tcpi_rttvar 304 tcpi_snd_ssthresh 2147483647 tpci_snd_cwnd 2215 > tcpi_reordering 3 tcpi_total_retrans 0 > Local Remote Local Elapsed Throughput Throughput Local Local Remote Remote Local Remote Service > Send Socket Recv 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 > 4194304 6291456 16384 20.17 149.54 10^6bits/s 0.40 S 0.78 S 10.467 20.554 usec/KB > > > Now with 16MB I got : > Sorry message was sent too soon : lpaa23:~# DUMP_TCP_INFO=1 ./netperf -H 10.7.8.152 -Cc -t OMNI -l 20 OMNI Send TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.7.8.152 () port 0 AF_INET tcpi_rto 281000 tcpi_ato 0 tcpi_pmtu 1476 tcpi_rcv_ssthresh 28720 tcpi_rtt 80438 tcpi_rttvar 25 tcpi_snd_ssthresh 2147483647 tpci_snd_cwnd 5895 tcpi_reordering 3 tcpi_total_retrans 0 Local Remote Local Elapsed Throughput Throughput Local Local Remote Remote Local Remote Service Send Socket Recv 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 16777216 16777216 16384 20.31 399.75 10^6bits/s 0.55 S 0.65 S 5.375 6.416 usec/KB -- 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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