https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255571
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: b...@freebsd.org
Reporter: jcap...@blackberry.com
Overview
--------
Setting mtu=9000 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
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