RE: [Xen-users] low network performance

Schmidt, Werner (Werner)
2007-06-01T07:55:52Z

Note that i had similar problems in my tests (I tested the domU and dom0
network performance of multiple machines connected via Gigabit lan with
''iperf '')

;

If you use the standard bridge configuration (which I assume is true for
your system), you might try to get a better performance by modifying the
''txqueuelen'' parameter of the vif devices connecting the domUs
to the
dom0 bridge (''ifconfig vifx.y'' will show the value of this
parameter)

You can see with  ''brctl show'' which vifs are involved.



In my case, the value was set to ''32''

I got substantially better results of dom0->domU performance (and domU
-> domU performance) by changing this value to 128 ..512:

''ip link set vifx.y txqueuelen <value>'' will do this
change for you



Werner