[Bug 209533] FreeBSD iperf performance abnormal when iperf -s as server

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209533

            Bug ID: 209533
           Summary: FreeBSD iperf performance abnormal when iperf -s as
                    server
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: tests
          Assignee: freebsd-testing at freebsd.org
          Reporter: mcquay_debug at mcquay.com.cn
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

install four test systems on the same ESXi 6.0 update 2

FreeBSD10.3  IP 10.10.10.103
RHEL66       IP 10.10.10.66
FreeBSD10.3
RHEL66

netowrk Cards are vmxnet3, these test OS all in the same ESXi host, the same
vswitcher, the same subnet, otherwise no adjustment is installed by default

When FreeBSD running iperf as server : iperf -s

Any other client iperf -c 10.10.10.103 (FreeBSD 10.3 IP address)
Speed is generally 7.xG

But RHEL66 run iperf as server: iperf -s
Any client iperf -c 10.10.10.66 (RHEL66 IP address)
Speeds of up to 30G, 38G highest

And then on another host ESXi6.0 update2 test, the situation is still so
FreeBSD run ipers -c as client ,speed can reach 38G
But FreeBSD run iperf -s as server, the speed only 8G

test result:

root at freebsd103:~ # uname -a
FreeBSD freebsd103 10.3-RELEASE-p2 FreeBSD 10.3-RELEASE-p2 #0: Wed May  4
06:03:51 UTC 2016    
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
root at freebsd103:~ #
root at freebsd103:~ # iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[  4] local 10.10.10.103 port 5001 connected with 10.10.10.66 port 38535
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  9.14 GBytes  7.85 Gbits/sec
^Croot at freebsd103:~ # iperf -c rhel66
------------------------------------------------------------
Client connecting to rhel66, TCP port 5001
TCP window size: 32.5 KByte (default)
------------------------------------------------------------
[  3] local 10.10.10.103 port 10056 connected with 10.10.10.66 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  45.2 GBytes  38.8 Gbits/sec
root at freebsd103:~ #

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