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RE: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus


  • To: "xen-ia64-devel@xxxxxxxxxxxxxxxxxxx" <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "You, Yongkang" <yongkang.you@xxxxxxxxx>
  • Date: Wed, 6 May 2009 13:54:15 +0800
  • Accept-language: en-US
  • Acceptlanguage: en-US
  • Delivery-date: Tue, 05 May 2009 22:54:59 -0700
  • List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
  • Thread-index: AcnODgXEmMNLyyX7TV+loyb/eVRJoAAAPpwA
  • Thread-topic: [Xen-ia64-devel] A strange issue when VTI guest vcpus number is near pcpus

On  xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote:
> Hi,
> 
> When I try recently Xen (Xen 3.4 rc3) on IA64 machine
> (Tiger4), I found some strange issue.
> 
> My two systems have 4 and 8 pcpus separately
> 
> If VTI guest's vcpus is near pcpus, guest booting will meet
> some issues:
> 1. Guest boot might be hang at "switch to new root and run
> init; unmounting old /dev ...; unmounting old /sys" for a long time.
> 2. After guest boot up, it might report "illegal instructions"
> for command or report "readonly filesystem".
> 
> I didn't catch it in UP or 2 vcpus conditions.
> 
> Looks a qemu issue? Did you meet it also?
> 

If I double vcpus ( 2*pcups), this issue is more easy to happen. I didn't try 
multi guest yet. 

Thanks,
Yongkang
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