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Date: Sat, 11 Jul 2020 17:53:25 +0200 From: Ian Kumlien <ian.kumlien@...il.com> To: Linux Kernel Network Developers <netdev@...r.kernel.org> Subject: NAT performance issue 944mbit -> ~40mbit Hi, I first detected this with 5.7.6 but it seems to apply as far back as 5.6.1... (so, 5.7.8 client -> nat (5.6.1 -> 5.8-rc4 -> server 5.7.7) It seems to me that the window size doesn't advance, so i did revert the tcp: grow window for OOO packets only for SACK flows [1] but it did no difference... I have a 384 MB tcpdump of a iperf3 session that starts low and then actually starts to get the bandwidth... I do use BBR - I have tried with cubic... it didn't help - the NAT machine does use fq but changing it doesn't seem to yield any other results. Doing -P10 gives you the bandwith and can sometimes break the stalemate but you'll end up back with the lower transfer speed again. (it only seems to apply to NAT - the machine is a: A2SDi-12C-HLN4F and has handled this without problems in the past...) [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.7.8&id=bf780119617797b5690e999e59a64ad79a572374 First iperf3 as a reference: [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 113 MBytes 945 Mbits/sec 0 814 KBytes [ 5] 1.00-2.00 sec 109 MBytes 912 Mbits/sec 0 806 KBytes [ 5] 2.00-3.00 sec 112 MBytes 944 Mbits/sec 31 792 KBytes [ 5] 3.00-4.00 sec 101 MBytes 849 Mbits/sec 31 1.18 MBytes [ 5] 4.00-5.00 sec 108 MBytes 902 Mbits/sec 0 783 KBytes [ 5] 5.00-6.00 sec 111 MBytes 933 Mbits/sec 31 778 KBytes [ 5] 6.00-7.00 sec 111 MBytes 933 Mbits/sec 93 772 KBytes [ 5] 7.00-8.00 sec 112 MBytes 944 Mbits/sec 0 778 KBytes [ 5] 8.00-9.00 sec 111 MBytes 933 Mbits/sec 60 778 KBytes [ 5] 9.00-10.00 sec 111 MBytes 933 Mbits/sec 92 814 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 1.07 GBytes 923 Mbits/sec 338 sender [ 5] 0.00-10.01 sec 1.07 GBytes 919 Mbits/sec receiver After that: [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 4.77 MBytes 40.0 Mbits/sec 0 42.4 KBytes [ 5] 1.00-2.00 sec 4.10 MBytes 34.4 Mbits/sec 0 84.8 KBytes [ 5] 2.00-3.00 sec 4.60 MBytes 38.6 Mbits/sec 0 87.7 KBytes [ 5] 3.00-4.00 sec 4.23 MBytes 35.4 Mbits/sec 0 42.4 KBytes [ 5] 4.00-5.00 sec 4.23 MBytes 35.4 Mbits/sec 0 42.4 KBytes [ 5] 5.00-6.00 sec 4.47 MBytes 37.5 Mbits/sec 0 76.4 KBytes [ 5] 6.00-7.00 sec 5.47 MBytes 45.9 Mbits/sec 0 67.9 KBytes [ 5] 7.00-8.00 sec 4.66 MBytes 39.1 Mbits/sec 0 67.9 KBytes [ 5] 8.00-9.00 sec 4.35 MBytes 36.5 Mbits/sec 0 82.0 KBytes [ 5] 9.00-10.00 sec 4.66 MBytes 39.1 Mbits/sec 0 139 KBytes - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 45.5 MBytes 38.2 Mbits/sec 0 sender [ 5] 0.00-10.00 sec 45.0 MBytes 37.8 Mbits/sec receiver You even get some: [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 5.38 MBytes 45.2 Mbits/sec 0 42.4 KBytes [ 5] 1.00-2.00 sec 7.08 MBytes 59.4 Mbits/sec 0 535 KBytes [ 5] 2.00-3.00 sec 108 MBytes 907 Mbits/sec 0 778 KBytes [ 5] 3.00-4.00 sec 111 MBytes 933 Mbits/sec 0 814 KBytes [ 5] 4.00-5.00 sec 91.2 MBytes 765 Mbits/sec 0 829 KBytes [ 5] 5.00-6.00 sec 111 MBytes 933 Mbits/sec 0 783 KBytes [ 5] 6.00-7.00 sec 111 MBytes 933 Mbits/sec 0 769 KBytes [ 5] 7.00-8.00 sec 111 MBytes 933 Mbits/sec 0 778 KBytes [ 5] 8.00-9.00 sec 112 MBytes 944 Mbits/sec 0 809 KBytes [ 5] 9.00-10.00 sec 110 MBytes 923 Mbits/sec 0 823 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 879 MBytes 738 Mbits/sec 0 sender [ 5] 0.00-10.00 sec 875 MBytes 734 Mbits/sec receiver
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