Re: [Xen-users] GPLPV Driver and SMP

[Klaus Steinberger <klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx>]

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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