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[Xen-users] iscsi throughput in DomU

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Thomas Pöhler <tp@xxxxxxxxxxxxxxxxxxxxxxx>
  • Date: Fri, 13 Jan 2012 16:05:35 +0100
  • Delivery-date: Fri, 13 Jan 2012 15:06:45 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AczSBM07jdXe8OVvR4C1BMVhgZrN9Q==
  • Thread-topic: iscsi throughput in DomU

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!




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