Date: Mon, 03 May 2021 16:02:50 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 255571] vmx mtu 9000 performance issues Message-ID: <bug-255571-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255571 Bug ID: 255571 Summary: vmx mtu 9000 performance issues Product: Base System Version: 12.2-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: jcaplan@blackberry.com Overview -------- Setting mtu=3D9000 for a vmx interface on vmware VM and running iperf2, performance goes down to 272 kb/s from 943 Mb/s with default 1500 mtu. Steps to Reproduce ------------------ 1) On host, change interface to 9000 # ifconfig vmnet20 mtu 9000 2) On target do the same: root@freebsd: # ifconfig vmx0 mtu 9000 3) Run iperf root@freebsd: # iperf -s Actual Results -------------- On freebsd target: # ./src/iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ (null)local 172.16.129.205 port 5001 connected with 172.16.129.1 port 34798 On host: iperf -c 172.16.129.205 ------------------------------------------------------------ Client connecting to 172.16.129.205, TCP port 5001 TCP window size: 325 KByte (default) ------------------------------------------------------------ [ 3] local 172.16.129.1 port 34798 connected with 172.16.129.205 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 335 KBytes 272 Kbits/sec Expected Results ---------------- iperf shouldn't hang on target and performance should be similar to 1500 mtu case. Build Date & Hardware: ---------------------- FreeBSD freebsd 12.2-RELEASE FreeBSD 12.2-RELEASE r366954 GENERIC amd64 --=20 You are receiving this mail because: You are the assignee for the bug.=
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