Hi James,
It looks like it waits too long for packets to be sent.
In testing from Dom0 to DomU with vcpus=4 I get marginally worse
performance than with vcpus=1. Can you tell me as much as you can
about
the above setup so I can attempt to reproduce it?
The domU is a Windows 2003 x86_64 Server with all Updates.
I tested it with both vcpu=1 and vcpu=2
domU Memory: 4 GByte
The dom0 runs on a Dell Poweredge 6800 with 4 Xeon 2.6 Ghz Dualcore, 16
GByte Memory connected to a SAN.
Here are my tests:
From dom0 to domU with dual test:
[root@xen02 ~]# iperf -c tsm-neu.bl-group.physik.uni-muenchen.de -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to tsm-neu.bl-group.physik.uni-muenchen.de, TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
[ 5] local 192.168.160.91 port 48790 connected with 192.168.180.199
port 5001
[ 4] local 192.168.160.91 port 5001 connected with 192.168.180.199 port
1120
[ 5] 0.0-10.0 sec 339 MBytes 284 Mbits/sec
[ 4] 0.0-10.0 sec 344 KBytes 281 Kbits/sec
As you can see the direction to the domU is fast, but the other way is a
factor of 1000 slower.
Now the client on domU:
[root@xen02 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
[ 4] local 192.168.160.91 port 5001 connected with 192.168.180.199 port
1121
[ 4] 0.0-10.6 sec 264 KBytes 204 Kbits/sec
[root@xen02 ~]#
Now with -d on the client:
[root@xen02 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
[ 4] local 192.168.160.91 port 5001 connected with 192.168.180.199 port
1122
------------------------------------------------------------
Client connecting to 192.168.180.199, TCP port 5001
TCP window size: 1.00 MByte (default)
------------------------------------------------------------
[ 6] local 192.168.160.91 port 36322 connected with 192.168.180.199
port 5001
[ 6] 0.0-10.0 sec 340 MBytes 285 Mbits/sec
[ 4] 0.0-10.3 sec 632 KBytes 503 Kbits/sec
[root@xen02 ~]#
Sincerly,
Klaus
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