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Date: Thu, 10 Mar 2011 21:25:17 -0500 From: Bill Fink <billfink@...dspring.com> To: Lucas Nussbaum <lucas.nussbaum@...ia.fr> Cc: Stephen Hemminger <stephen.hemminger@...tta.com>, Injong Rhee <rhee@...u.edu>, David Miller <davem@...emloft.net>, xiyou wangcong <xiyou.wangcong@...il.com>, netdev@...r.kernel.org, sangtae ha <sangtae.ha@...il.com> Subject: Re: [PATCH] Make CUBIC Hystart more robust to RTT variations On Thu, 10 Mar 2011, Lucas Nussbaum wrote: > On 10/03/11 at 02:17 -0500, Bill Fink wrote: > > On Wed, 9 Mar 2011, Stephen Hemminger wrote: > > > > > Bill what is the HZ in your kernel config. > > > I am concerned hystart doesn't work well with HZ=100 > > > > HZ=1000 > > > > But I did have tcp_timestamps disabled. Should I re-run > > the tests with tcp_timestamps enabled? > > I ran my tests with timestamps enabled and HZ=250. If you have the > opportunity to run tests in the same config, it would be great. The > HZ=250 vs HZ=1000 difference could explain why it's working. > > However, enabling or disabling timestamps shouldn't make a difference, > since the hystart code doesn't use TCP_CONG_RTT_STAMP. I reran the same tests with HZ=250 and tcp_timestamps enabled. BTW all my tests are with 9000-byte jumbo frames. If you want, I can also try them using standard 1500-byte Ethernet frames. First on the 18 ms RTT path: 8 GB transfer across an 18 ms RTT path with autotuning and hystart: i7test7% nuttcp -n8g -i1 192.168.1.23 614.5625 MB / 1.00 sec = 5155.1383 Mbps 0 retrans 824.2500 MB / 1.00 sec = 6914.5038 Mbps 0 retrans 826.6875 MB / 1.00 sec = 6934.5632 Mbps 0 retrans 831.5625 MB / 1.00 sec = 6975.7146 Mbps 0 retrans 835.1875 MB / 1.00 sec = 7006.1867 Mbps 0 retrans 844.8125 MB / 1.00 sec = 7086.7867 Mbps 0 retrans 862.1250 MB / 1.00 sec = 7231.9274 Mbps 0 retrans 886.5625 MB / 1.00 sec = 7437.0402 Mbps 0 retrans 918.6875 MB / 1.00 sec = 7706.5633 Mbps 0 retrans 8192.0000 MB / 9.80 sec = 7009.7460 Mbps 12 %TX 31 %RX 0 retrans 18.91 msRTT Ramps up quickly to a little under 7 Gbps, then increases more slowly to 7.7 Gbps, with no TCP retransmissions. Actually performed somewhat better than the HZ=1000 case. 8 GB transfer across an 18 ms RTT path with 40 MB socket buffer and hystart: i7test7% nuttcp -n8g -i1 -w40m 192.168.1.23 716.0000 MB / 1.00 sec = 6006.0812 Mbps 0 retrans 864.5000 MB / 1.00 sec = 7251.9589 Mbps 0 retrans 866.1250 MB / 1.00 sec = 7265.4596 Mbps 0 retrans 871.1250 MB / 1.00 sec = 7307.7746 Mbps 0 retrans 875.6250 MB / 1.00 sec = 7345.2308 Mbps 0 retrans 886.1875 MB / 1.00 sec = 7433.8796 Mbps 0 retrans 904.1250 MB / 1.00 sec = 7584.3654 Mbps 0 retrans 929.1875 MB / 1.00 sec = 7794.4728 Mbps 0 retrans 961.6250 MB / 1.00 sec = 8066.7839 Mbps 0 retrans 8192.0000 MB / 9.34 sec = 7356.7856 Mbps 13 %TX 32 %RX 0 retrans 18.92 msRTT Ramps up quickly to 7+ Gbps, then increases more slowly to 8+ Gbps, with no TCP retransmissions. Performed significantly worse than the HZ=1000 case. 8 GB transfer across an 18 ms RTT path with autotuning and no hystart: i7test7% nuttcp -n8g -i1 192.168.1.23 850.8750 MB / 1.00 sec = 7137.3642 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.3396 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.5486 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.5883 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.0621 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.4396 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.5189 Mbps 0 retrans 8192.0000 MB / 7.23 sec = 9499.4276 Mbps 17 %TX 40 %RX 0 retrans 18.95 msRTT Quickly ramps up to full 10-GigE line rate, with no TCP retrans. Same performance as HZ=1000 case. 8 GB transfer across an 18 ms RTT path with 40 MB socket buffer and no hystart: i7test7% nuttcp -n8g -i1 -w40m 192.168.1.23 969.8125 MB / 1.00 sec = 8135.2793 Mbps 0 retrans 1181.1250 MB / 1.00 sec = 9908.0541 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.1810 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.9044 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.0729 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.0532 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.9549 Mbps 0 retrans 8192.0000 MB / 7.15 sec = 9609.9893 Mbps 17 %TX 41 %RX 0 retrans 18.92 msRTT Also quickly ramps up to full 10-GigE line rate, with no TCP retrans. Same performance as HZ=1000 case. Now trying the same type of tests across an 80 ms RTT path. 8 GB transfer across an 80 ms RTT path with autotuning and hystart: i7test7% nuttcp -n8g -i1 192.168.1.18 10.6250 MB / 1.00 sec = 89.1274 Mbps 0 retrans 501.7500 MB / 1.00 sec = 4208.6979 Mbps 0 retrans 872.9375 MB / 1.00 sec = 7323.2651 Mbps 0 retrans 865.5000 MB / 1.00 sec = 7259.8901 Mbps 0 retrans 854.9375 MB / 1.00 sec = 7172.0224 Mbps 0 retrans 872.0000 MB / 1.00 sec = 7314.8735 Mbps 0 retrans 866.6875 MB / 1.00 sec = 7270.3017 Mbps 0 retrans 855.1250 MB / 1.00 sec = 7172.9354 Mbps 0 retrans 868.7500 MB / 1.00 sec = 7288.1352 Mbps 0 retrans 868.3750 MB / 1.00 sec = 7283.8238 Mbps 0 retrans 8192.0000 MB / 10.99 sec = 6250.8745 Mbps 11 %TX 25 %RX 0 retrans 80.78 msRTT Similar to the 20 ms RTT path, but achieving somewhat lower performance levels, presumably due to the larger RTT. Ramps up fairly quickly to 7+ Gbps, then appears to stabilize at that level, with no TCP retransmissions. Somewhat better performance than the HZ=1000 case. 8 GB transfer across an 80 ms RTT path with 100 MB socket buffer and hystart: i7test7% nuttcp -n8g -i1 -w100m 192.168.1.18 103.8125 MB / 1.00 sec = 870.8197 Mbps 0 retrans 1071.6875 MB / 1.00 sec = 8989.8315 Mbps 0 retrans 1089.6250 MB / 1.00 sec = 9140.6929 Mbps 0 retrans 1093.4375 MB / 1.00 sec = 9172.4186 Mbps 0 retrans 1095.1875 MB / 1.00 sec = 9187.1262 Mbps 0 retrans 1094.7500 MB / 1.00 sec = 9183.3460 Mbps 0 retrans 1097.8750 MB / 1.00 sec = 9208.9431 Mbps 0 retrans 1103.9375 MB / 1.00 sec = 9261.2584 Mbps 0 retrans 8192.0000 MB / 8.48 sec = 8102.4984 Mbps 15 %TX 38 %RX 0 retrans 80.81 msRTT Quickly ramps up to 9 Gbps and then slowly increases further, with no TCP retrans. Basically same performance as HZ=1000 case. 8 GB transfer across an 80 ms RTT path with autotuning and no hystart: i7test7% nuttcp -n8g -i1 192.168.1.18 10.0000 MB / 1.00 sec = 83.8847 Mbps 0 retrans 482.3125 MB / 1.00 sec = 4045.8172 Mbps 0 retrans 863.2500 MB / 1.00 sec = 7241.4224 Mbps 0 retrans 874.3750 MB / 1.00 sec = 7334.7304 Mbps 0 retrans 855.0000 MB / 1.00 sec = 7172.3889 Mbps 0 retrans 863.6250 MB / 1.00 sec = 7244.6840 Mbps 0 retrans 875.0625 MB / 1.00 sec = 7340.5489 Mbps 0 retrans 855.1875 MB / 1.00 sec = 7173.6390 Mbps 0 retrans 863.8750 MB / 1.00 sec = 7246.9044 Mbps 0 retrans 873.3125 MB / 1.00 sec = 7325.9788 Mbps 0 retrans 8192.0000 MB / 10.99 sec = 6253.7478 Mbps 11 %TX 26 %RX 0 retrans 80.80 msRTT Ramps up quickly to 7+ Gbps, then appears to stabilize at that level, with no TCP retransmissions. Performance is same as with autotuning enabled, but less than using a manually set 100 MB socket buffer. Same performance as HZ=1000 case. 8 GB transfer across an 80 ms RTT path with 100 MB socket buffer and no hystart: i7test7% nuttcp -n8g -i1 -w100m 192.168.1.18 103.8125 MB / 1.00 sec = 870.7945 Mbps 0 retrans 1148.4375 MB / 1.00 sec = 9633.6860 Mbps 0 retrans 1176.9375 MB / 1.00 sec = 9872.7291 Mbps 0 retrans 1088.1250 MB / 1.00 sec = 9127.4342 Mbps 39 retrans 171.0625 MB / 1.00 sec = 1435.1370 Mbps 0 retrans 901.0625 MB / 1.00 sec = 7558.3275 Mbps 0 retrans 1160.0625 MB / 1.00 sec = 9731.1831 Mbps 0 retrans 1172.5625 MB / 1.00 sec = 9836.5508 Mbps 0 retrans 1085.0625 MB / 1.00 sec = 9101.2174 Mbps 31 retrans 150.3750 MB / 1.00 sec = 1261.5908 Mbps 2 retrans 28.1875 MB / 1.00 sec = 236.4544 Mbps 0 retrans 8192.0000 MB / 11.31 sec = 6077.0651 Mbps 14 %TX 29 %RX 72 retrans 80.82 msRTT As in the HZ=1000 case, disabling hystart on a large RTT path does not seem to play nice with a manually specified socket buffer, resulting in TCP retransmissions that limit the effective network performance. Performance seems similar to the HZ=1000 case. This is a repeatable phenomenon, but didn't seem quite as variable as in the HZ=1000 case (but probably need a larger number of repetitions to draw any firm conclusions about that). i7test7% nuttcp -n8g -i1 -w100m 192.168.1.18 103.4375 MB / 1.00 sec = 867.6472 Mbps 0 retrans 1143.0625 MB / 1.00 sec = 9589.1347 Mbps 0 retrans 629.4375 MB / 1.00 sec = 5280.0886 Mbps 24 retrans 164.8750 MB / 1.00 sec = 1383.0759 Mbps 0 retrans 1121.6250 MB / 1.00 sec = 9408.7878 Mbps 0 retrans 1168.1250 MB / 1.00 sec = 9799.0309 Mbps 0 retrans 1167.5000 MB / 1.00 sec = 9793.5725 Mbps 0 retrans 1165.9375 MB / 1.00 sec = 9780.0841 Mbps 0 retrans 959.8750 MB / 1.00 sec = 8052.4902 Mbps 9 retrans 568.1250 MB / 1.00 sec = 4765.8065 Mbps 0 retrans 8192.0000 MB / 10.03 sec = 6852.2803 Mbps 13 %TX 32 %RX 33 retrans 80.81 msRTT And: i7test7% nuttcp -n8g -i1 -w100m 192.168.1.18 103.8125 MB / 1.00 sec = 870.8241 Mbps 0 retrans 1148.8125 MB / 1.00 sec = 9636.9570 Mbps 0 retrans 1177.3750 MB / 1.00 sec = 9876.4287 Mbps 0 retrans 1177.4375 MB / 1.00 sec = 9877.0024 Mbps 0 retrans 693.5000 MB / 1.00 sec = 5817.6335 Mbps 36 retrans 263.4375 MB / 1.00 sec = 2209.7701 Mbps 0 retrans 1137.3125 MB / 1.00 sec = 9540.7263 Mbps 0 retrans 1169.9375 MB / 1.00 sec = 9814.2354 Mbps 0 retrans 1168.6875 MB / 1.00 sec = 9803.7005 Mbps 0 retrans 8192.0000 MB / 9.21 sec = 7460.8789 Mbps 14 %TX 34 %RX 36 retrans 80.81 msRTT Re-enabling hystart immediately gives a clean test with no TCP retrans. i7test7% nuttcp -n8g -i1 -w100m 192.168.1.18 103.8125 MB / 1.00 sec = 870.8075 Mbps 0 retrans 1072.3125 MB / 1.00 sec = 8995.0653 Mbps 0 retrans 1089.4375 MB / 1.00 sec = 9139.0926 Mbps 0 retrans 1093.1875 MB / 1.00 sec = 9170.0646 Mbps 0 retrans 1095.5625 MB / 1.00 sec = 9190.3914 Mbps 0 retrans 1095.5000 MB / 1.00 sec = 9189.8303 Mbps 0 retrans 1097.6875 MB / 1.00 sec = 9207.8952 Mbps 0 retrans 1104.1875 MB / 1.00 sec = 9262.5405 Mbps 0 retrans 8192.0000 MB / 8.48 sec = 8104.4831 Mbps 15 %TX 38 %RX 0 retrans 80.77 msRTT -Bill Previous HZ=1000 tests (with tcp_timestamps disabled): Here are some tests I performed across real networks, where congestion is generally not an issue, with a 2.6.35 kernel on the transmit side. 8 GB transfer across an 18 ms RTT path with autotuning and hystart: i7test7% nuttcp -n8g -i1 192.168.1.23 517.9375 MB / 1.00 sec = 4344.6096 Mbps 0 retrans 688.4375 MB / 1.00 sec = 5775.1998 Mbps 0 retrans 692.9375 MB / 1.00 sec = 5812.7462 Mbps 0 retrans 698.0625 MB / 1.00 sec = 5855.8078 Mbps 0 retrans 699.8750 MB / 1.00 sec = 5871.0123 Mbps 0 retrans 710.5625 MB / 1.00 sec = 5960.5707 Mbps 0 retrans 728.8125 MB / 1.00 sec = 6113.7652 Mbps 0 retrans 751.3750 MB / 1.00 sec = 6302.9210 Mbps 0 retrans 783.8750 MB / 1.00 sec = 6575.6201 Mbps 0 retrans 825.1875 MB / 1.00 sec = 6921.8145 Mbps 0 retrans 875.4375 MB / 1.00 sec = 7343.9811 Mbps 0 retrans 8192.0000 MB / 11.26 sec = 6102.4718 Mbps 11 %TX 28 %RX 0 retrans 18.92 msRTT Ramps up quickly to a little under 6 Gbps, then increases more slowly to 7+ Gbps, with no TCP retransmissions. 8 GB transfer across an 18 ms RTT path with 40 MB socket buffer and hystart: i7test7% nuttcp -n8g -w40m -i1 192.168.1.23 970.0625 MB / 1.00 sec = 8136.8475 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9909.0045 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9908.6369 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.8747 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.0531 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9908.8153 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.0729 Mbps 0 retrans 8192.0000 MB / 7.13 sec = 9633.5814 Mbps 17 %TX 42 %RX 0 retrans 18.91 msRTT Quickly ramps up to full 10-GigE line rate, with no TCP retrans. 8 GB transfer across an 18 ms RTT path with autotuning and no hystart: i7test7% nuttcp -n8g -i1 192.168.1.23 845.4375 MB / 1.00 sec = 7091.5828 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9910.0134 Mbps 0 retrans 1181.0625 MB / 1.00 sec = 9907.1830 Mbps 0 retrans 1181.4375 MB / 1.00 sec = 9910.8936 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.1721 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.5774 Mbps 0 retrans 1181.1875 MB / 1.00 sec = 9908.6874 Mbps 0 retrans 8192.0000 MB / 7.25 sec = 9484.4524 Mbps 18 %TX 41 %RX 0 retrans 18.92 msRTT Also quickly ramps up to full 10-GigE line rate, with no TCP retrans. 8 GB transfer across an 18 ms RTT path with 40 MB socket buffer and no hystart: i7test7% nuttcp -n8g -w40m -i1 192.168.1.23 969.8750 MB / 1.00 sec = 8135.6571 Mbps 0 retrans 1181.3125 MB / 1.00 sec = 9909.3990 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9908.9342 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.4098 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9908.8252 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.0630 Mbps 0 retrans 1181.2500 MB / 1.00 sec = 9909.3504 Mbps 0 retrans 8192.0000 MB / 7.15 sec = 9611.8053 Mbps 18 %TX 42 %RX 0 retrans 18.95 msRTT Basically the same as the case with 40 MB socket buffer and hystart enabled. Now trying the same type of tests across an 80 ms RTT path. 8 GB transfer across an 80 ms RTT path with autotuning and hystart: i7test7% nuttcp -n8g -i1 192.168.1.18 11.3125 MB / 1.00 sec = 94.8954 Mbps 0 retrans 441.5625 MB / 1.00 sec = 3704.1021 Mbps 0 retrans 687.3750 MB / 1.00 sec = 5765.8657 Mbps 0 retrans 715.5625 MB / 1.00 sec = 6002.6273 Mbps 0 retrans 709.9375 MB / 1.00 sec = 5955.5958 Mbps 0 retrans 691.3125 MB / 1.00 sec = 5799.0626 Mbps 0 retrans 718.6250 MB / 1.00 sec = 6028.3538 Mbps 0 retrans 718.0000 MB / 1.00 sec = 6023.0205 Mbps 0 retrans 704.0000 MB / 1.00 sec = 5905.5387 Mbps 0 retrans 733.3125 MB / 1.00 sec = 6151.4096 Mbps 0 retrans 738.8750 MB / 1.00 sec = 6198.2381 Mbps 0 retrans 731.8750 MB / 1.00 sec = 6139.3695 Mbps 0 retrans 8192.0000 MB / 12.85 sec = 5348.9677 Mbps 10 %TX 23 %RX 0 retrans 80.81 msRTT Similar to the 20 ms RTT path, but achieving somewhat lower performance levels, presumably due to the larger RTT. Ramps up fairly quickly to a little under 6 Gbps, then increases more slowly to 6+ Gbps, with no TCP retransmissions. 8 GB transfer across an 80 ms RTT path with 100 MB socket buffer and hystart: i7test7% nuttcp -n8g -w100m -i1 192.168.1.18 103.9375 MB / 1.00 sec = 871.8378 Mbps 0 retrans 1086.5625 MB / 1.00 sec = 9114.6102 Mbps 0 retrans 1106.6875 MB / 1.00 sec = 9283.5583 Mbps 0 retrans 1109.3125 MB / 1.00 sec = 9305.5226 Mbps 0 retrans 1111.1875 MB / 1.00 sec = 9321.9596 Mbps 0 retrans 1112.8125 MB / 1.00 sec = 9334.8452 Mbps 0 retrans 1113.6875 MB / 1.00 sec = 9341.6620 Mbps 0 retrans 1120.2500 MB / 1.00 sec = 9398.0054 Mbps 0 retrans 8192.0000 MB / 8.37 sec = 8207.2049 Mbps 16 %TX 38 %RX 0 retrans 80.81 msRTT Quickly ramps up to 9+ Gbps and then slowly increases further, with no TCP retrans. 8 GB transfer across an 80 ms RTT path with autotuning and no hystart: i7test7% nuttcp -n8g -i1 192.168.1.18 11.2500 MB / 1.00 sec = 94.3703 Mbps 0 retrans 519.0625 MB / 1.00 sec = 4354.1596 Mbps 0 retrans 861.2500 MB / 1.00 sec = 7224.7970 Mbps 0 retrans 871.0000 MB / 1.00 sec = 7306.4191 Mbps 0 retrans 860.7500 MB / 1.00 sec = 7220.4438 Mbps 0 retrans 869.0625 MB / 1.00 sec = 7290.3340 Mbps 0 retrans 863.4375 MB / 1.00 sec = 7242.7707 Mbps 0 retrans 860.4375 MB / 1.00 sec = 7218.0606 Mbps 0 retrans 875.5000 MB / 1.00 sec = 7344.3071 Mbps 0 retrans 863.1875 MB / 1.00 sec = 7240.8257 Mbps 0 retrans 8192.0000 MB / 10.98 sec = 6259.4379 Mbps 12 %TX 27 %RX 0 retrans 80.81 msRTT Ramps up quickly to 7+ Gbps, then appears to stabilize at that level, with no TCP retransmissions. Performance is somewhat better than with autotuning enabled, but less than using a manually set 100 MB socket buffer. 8 GB transfer across an 80 ms RTT path with 100 MB socket buffer and no hystart: i7test7% nuttcp -n8g -w100m -i1 192.168.1.18 102.8750 MB / 1.00 sec = 862.9487 Mbps 0 retrans 522.8750 MB / 1.00 sec = 4386.2811 Mbps 414 retrans 881.5625 MB / 1.00 sec = 7394.6534 Mbps 0 retrans 1164.3125 MB / 1.00 sec = 9766.6682 Mbps 0 retrans 1170.5625 MB / 1.00 sec = 9819.7042 Mbps 0 retrans 1166.8125 MB / 1.00 sec = 9788.2067 Mbps 0 retrans 1159.8750 MB / 1.00 sec = 9729.1530 Mbps 0 retrans 811.1250 MB / 1.00 sec = 6804.8017 Mbps 21 retrans 73.2500 MB / 1.00 sec = 614.4674 Mbps 0 retrans 884.6250 MB / 1.00 sec = 7420.2900 Mbps 0 retrans 8192.0000 MB / 10.34 sec = 6647.9394 Mbps 13 %TX 31 %RX 435 retrans 80.81 msRTT Disabling hystart on a large RTT path does not seem to play nice with a manually specified socket buffer, resulting in TCP retransmissions that limit the effective network performance. This is a repeatable but extremely variable phenomenon. i7test7% nuttcp -n8g -w100m -i1 192.168.1.18 103.7500 MB / 1.00 sec = 870.3015 Mbps 0 retrans 1146.3750 MB / 1.00 sec = 9616.4520 Mbps 0 retrans 1175.9375 MB / 1.00 sec = 9864.6070 Mbps 0 retrans 615.6875 MB / 1.00 sec = 5164.7353 Mbps 21 retrans 139.2500 MB / 1.00 sec = 1168.1253 Mbps 0 retrans 1090.0625 MB / 1.00 sec = 9143.8053 Mbps 0 retrans 1170.4375 MB / 1.00 sec = 9818.6654 Mbps 0 retrans 1174.5625 MB / 1.00 sec = 9852.8754 Mbps 0 retrans 1174.8750 MB / 1.00 sec = 9855.6052 Mbps 0 retrans 8192.0000 MB / 9.42 sec = 7292.9879 Mbps 14 %TX 34 %RX 21 retrans 80.81 msRTT And: i7test7% nuttcp -n8g -w100m -i1 192.168.1.18 102.8125 MB / 1.00 sec = 862.4227 Mbps 0 retrans 1148.4375 MB / 1.00 sec = 9633.6860 Mbps 0 retrans 1177.4375 MB / 1.00 sec = 9877.3086 Mbps 0 retrans 1168.1250 MB / 1.00 sec = 9798.9133 Mbps 11 retrans 133.1250 MB / 1.00 sec = 1116.7457 Mbps 0 retrans 479.8750 MB / 1.00 sec = 4025.4631 Mbps 0 retrans 1150.6875 MB / 1.00 sec = 9652.4830 Mbps 0 retrans 1177.3125 MB / 1.00 sec = 9876.0624 Mbps 0 retrans 1177.3750 MB / 1.00 sec = 9876.0139 Mbps 0 retrans 320.2500 MB / 1.00 sec = 2686.6452 Mbps 19 retrans 64.9375 MB / 1.00 sec = 544.7363 Mbps 0 retrans 73.6250 MB / 1.00 sec = 617.6113 Mbps 0 retrans 8192.0000 MB / 12.39 sec = 5545.7570 Mbps 12 %TX 26 %RX 30 retrans 80.80 msRTT Re-enabling hystart immediately gives a clean test with no TCP retrans. i7test7% nuttcp -n8g -w100m -i1 192.168.1.18 103.8750 MB / 1.00 sec = 871.3353 Mbps 0 retrans 1086.7500 MB / 1.00 sec = 9116.4474 Mbps 0 retrans 1105.8125 MB / 1.00 sec = 9276.2276 Mbps 0 retrans 1109.4375 MB / 1.00 sec = 9306.5339 Mbps 0 retrans 1111.3125 MB / 1.00 sec = 9322.5327 Mbps 0 retrans 1111.3750 MB / 1.00 sec = 9322.8053 Mbps 0 retrans 1113.7500 MB / 1.00 sec = 9342.8962 Mbps 0 retrans 1120.3125 MB / 1.00 sec = 9397.5711 Mbps 0 retrans 8192.0000 MB / 8.38 sec = 8204.8394 Mbps 16 %TX 39 %RX 0 retrans 80.80 msRTT -- 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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