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[Xen-users] How to setup low CPU priority domU

  • To: "xen-users@xxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxx>
  • From: Jan Hejl <jh@xxxxxxxxxx>
  • Date: Tue, 24 Sep 2013 09:57:56 +0200
  • Delivery-date: Tue, 24 Sep 2013 07:59:40 +0000
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  • List-id: Xen user discussion <xen-users.lists.xen.org>

Hello everyone,

i would like to use one of my domU with all 32 hardware cores but with lower priority (something like nice 10), but setting cpu weight seems to be someway unstable.

Dom0 is Gentoo with Xen 4.3.0, 2 AMD Opetrons 6274 (32 cores), 64GB of memory, but dom0 runs on 16 cores and 32GB of memory. Hosts 5 linux domUs with similiar configs, each from 2 to 4 cores, from 1GB to 4GB of memory. DomU with all cores is Windows Server 2008R2 Enterprise with Terminal Services installed.

When I set cpu-weight to 192 (others have 256 - default), it starts to lag. Applications became pretty slow and unstable.

Can someone help how CPU priority works with Xen? Is it stable already? Where to start debug this issue.


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