Date: Sun, 29 Sep 2019 21:11:29 +0100 From: Pete French <petefrench@ingresso.co.uk> To: freebsd-stable@freebsd.org Subject: Running iperf3 as a server drops all connections to a machine Message-ID: <E1iEfXV-0005xc-Pf@dilbert.ingresso.co.uk>
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This is odd - I have six FreeBSD boxes on the local ether here. Five are HP Microservers, one is an AMD Ryzen. They are all running 12.1 r352847 built yesterday - and its one compilation I did which is rsynced out to all the machines, so an identical build. I was running iperf3 -s on one machine and iperf3 -c on another to measure TCp/IP rates as I am experimenting with the RACK version of the stack and using CUBIC as a congetion control algorithm. All goes well between the Intel boxes, and if I use the Ryzen box as a client ot the Intel boxes. But if I run the iperf3 server on the Ryzemn box and use one of the Intel boxes as a client then after a few seconds all the TCP connection on the Ryzen box are dropped. There is nothing in dmesg, no indication that I can find of anything going wrong, and I can immediately ssh back in. On the client side it looks like this: [webadmin@dogbert ~]$ iperf3 -c dilbert Connecting to host dilbert, port 5201 [ 5] local 10.64.50.50 port 41134 connected to 10.64.50.6 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 112 MBytes 938 Mbits/sec 1 78.2 KBytes [ 5] 1.00-2.00 sec 112 MBytes 936 Mbits/sec 2 54.8 KBytes [ 5] 2.00-3.02 sec 14.7 MBytes 122 Mbits/sec 3 1.43 KBytes [ 5] 3.02-4.00 sec 0.00 Bytes 0.00 bits/sec 2 1.43 KBytes [ 5] 4.00-5.02 sec 0.00 Bytes 0.00 bits/sec 1 1.43 KBytes [ 5] 5.02-6.02 sec 0.00 Bytes 0.00 bits/sec 1 1.43 KBytes [ 5] 5.02-6.02 sec 0.00 Bytes 0.00 bits/sec 1 1.43 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-6.02 sec 238 MBytes 332 Mbits/sec 10 sender [ 5] 0.00-6.02 sec 0.00 Bytes 0.00 bits/sec receiver iperf3: error - the server has terminated [webadmin@dogbert ~]$ ...and on the server side, this... petefrench@dilbert ~]$ iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from 10.64.50.50, port 41133 [ 5] local 10.64.50.6 port 5201 connected to 10.64.50.50 port 41134 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 105 MBytes 883 Mbits/sec [ 5] 1.00-2.00 sec 112 MBytes 936 Mbits/sec [ 5] 2.00-3.01 sec 21.3 MBytes 177 Mbits/sec Connection to dilbert.ingresso.co.uk closed by remote host. Connection to dilbert.ingresso.co.uk closed. This only happens on the Ryzen machine. It happens whether I am using the RACk stack or the default one, and whether I am using CUBIC or the default too. The system is build with CPUTYPE set to 'core2' and some modules skipped, but apart from that nothing special. Its a bit worrying to me that this can happen, especially in userland. Any opinions or things people would ike me to check ? Indeed, can anyone reproduce this ? cheers, -pete.
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