Re: [Xen-users] high cpu usage on steal time

[Linux Hack <linuxhack2012@xxxxxxxxx>]

Hi,

I dont have higher steal at the moment and things are going well. I always checking using top on Dom0.

Is there any way to check CPU steal time for each Dom-U from Dom0 itself?

On Mon, Feb 4, 2013 at 8:20 AM, Peter Viskup <skupko.sk@xxxxxxxxx> wrote:

I don't want to step into discussion about my setup as I already discussed this here just some weeks before.
Do you still experience the issue with higher steal time or we can disregard this your request for support?
Do you see the steal time on dom0 or some domU?

On 02/04/2013 01:44 AM, Linux Hack wrote:

Hi Peter,

Seems things are going fine with minimum steal time cpu usage (vary between 5-20) with Xen 4.1.4 and latest centos 5.9 xen kernel.

What is the kernel you are running on your server?

On Sun, Feb 3, 2013 at 10:13 PM, Peter Viskup <skupko.sk@xxxxxxxxx> wrote:

On 02/02/2013 12:54 AM, Linux Hack wrote:

Hi,

One of the server is under high cpu usage and when checked steal time is causing the high cpu usage. However I have pinned the vcpu's for dom0 dedicatedly but still no luck.

Any thought's that would be great?

I had the same issue. Looks like things changed with newer PvOPs kernels (2.6.32+) and now the old fashioned setup of dedication of one CPU for dom0 (xm vcpu-pin 0 all 0) is causing performance issues and very high steal time on dom0. In my case I wasn't able to start any domU as the dom0 had not enough CPU time and it just ended with error (due to some timeout). Unfortunately nor Ian Campbell was able to tell me what is the reason of this behavior and what was changed.

Best regards,
--
Peter Viskup

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