[Xen-users] iscsi throughput in DomU

[Thomas Pöhler <tp@xxxxxxxxxxxxxxxxxxxxxxx>]

Hey Guys,

 

when starting a DomU we use iscsi as disks for our vms. When testing throughput I get half the troughput in contrast to tests on the Dom0 itself.

 

For Example:

I log in the target on the xenhost (Dom0) itself and get a troughput of 80mb/s. that’s ok

Now im starting the VM (DomU) and the same target is now attached as xvdb. When doing troughput tests the speed is about 40mb/s.

 

The DomU is paravirtualized linux. Im using xen 4.0.1 on debian squeeze.

 

 Is that an issue to the xen blkfront driver? Is that a normal performance drop?

Are there any tweaks?

 

Thanks for explanation and help!

 

Regards

Thomas

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