Hello,
I'm experimenting with the 10GBit Controller with a i82599 chip in a XEN
environment.
The current setup contains two physical machines connected by direct cable.
On one machine we ran a virtual machine. The VM's virtual network is bridged
to the physical network device.
|
Physical Node 1 Physical Node 2
| ____________
_______ 1.0.0.3 | VM |
|1.0.0.2| | br0----|eth0 1.0.0.1|
| eth0 | | | |
|_______| | eth0 |____________|
| |
|______________|_____|
|
We have additionally assigned a IP address to the bridge to test a TCP
connection between the VM and the dom0 hosting the VM. The TCP Connection is
created with iperf.
Test Source Destination Throughput
1 1.0.0.2 --> 1.0.0.3 9.35GBit/s
2.1 1.0.0.1 --> 1.0.0.3 2.45GBit/s
2.2 1.0.0.3 --> 1.0.0.1 1.88GBit/s
3.1 1.0.0.1 --> 1.0.0.2 2.64GBit/s
3.2 1.0.0.2 --> 1.0.0.1 70.2Kbit/s
When running a TCP connection with a destination inside the VM and a source on
a different machine, we get very poor performance.
To confirm that the problem is related to the IXGBE driver, we installed a
second 1GBit NIC (82576 Chip and igb driver). Here, we do not get such worst
RX performance.
Do you have any hints to locate the problem?
Thanks,
Andreas Grau
--
Andreas Grau
Universitaet Stuttgart, IPVS phone : +49(0)711 7816-236
Universitaetsstraße 38 fax : +49(0)711 7816-424
D-70569 Stuttgart email : andreas.g...@ipvs.uni-stuttgart.de
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