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[Xen-users] Dom0 CPU usage goes high if DomU is under heavy loading

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Tom Ting[丁郁庭] <tom_ting@xxxxxxxxxxx>
  • Date: Fri, 19 May 2017 06:59:18 +0000
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  • Delivery-date: Fri, 19 May 2017 07:00:30 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>
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  • Thread-topic: Dom0 CPU usage goes high if DomU is under heavy loading

Hi All


I’ve encounter following issue and need your advice.


Platform setting :

ARM64, 4 physical CPU, XEN-4.6

Dom0 :

- Network backend

- Running high wifi throughput (extremely high interrupt rate)

DomU :

- Media playback, 3D Graphic

- Video/GPU is using passthrough driver

- hooked to network via VIF


If Dom0 is running high network throughput and DomU is under idle state, Dom0 consumes about 140~150% observed from xentop.

Now we let DomU do some heavy workloads(ex: high-resolution-playback/3D graphic/consumes about 160%), Dom0 CPU will be affected and goes up to 190%.

I’ve tried to adjust parameters on credit-scheduler but improvement is limited.

Really appreciate for your adjustment or advice.





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