Hi,
I am facing the same probe in DomU<->DomU throughput via netper, and following this thread. after doing everything suggested now using iperf with iptables flushed on both DomUs and Dom0 I got these results in a simple an a bidirectional run.
[root@F11-G6S2 ~]# iperf -c 10.11.21.215 -t 120
------------------------------------------------------------
Client connecting to 10.11.21.215, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local 10.11.21.216 port 58883 connected with 10.11.21.215 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-120.5 sec 4.14 MBytes 288 Kbits/sec
[root@F11-G5S2 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 5] local 10.11.21.215 port 5001 connected with 10.11.21.216 port 58883
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-120.7 sec 4.14 MBytes 288 Kbits/sec
[root@F11-G6S2 ~]# iperf -c 10.11.21.215 -t 120 -r
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to
10.11.21.215, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 5] local 10.11.21.216 port 49735 connected with 10.11.21.215 port 5001
Waiting for server threads to complete. Interrupt again to force quit.
[ ID] Interval Transfer Bandwidth
[ 5] 0.0-120.5 sec 4.14 MBytes 288 Kbits/sec
[ 4] local 10.11.21.215 port 5001 connected with 10.11.21.216 port 49735
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-120.7 sec 4.14 MBytes 288 Kbits/sec
------------------------------------------------------------
Client connecting to 10.11.21.216, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 4] local 10.11.21.215 port 33522 connected with 10.11.21.216 port 5001
write2 failed: Broken pipe
[ ID] Interval Transfer Bandwidth
[ 4] 0.0- 0.0 sec 15.6 KBytes 99.0 Mbits/sec
the following 2 are CONFIG_NO_HZ=y, CONFIG_HIGH_RES_TIMERS=y configured. Also my clock source is XEN.
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