From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com>
Subject: Re: How to get the accurate physical CPU utilization in
 Dom0?
Date: Thu, 27 Feb 2014 16:40:54 +0100
Message-ID: <530F5C86.4060902@citrix.com>
References: <CAEQjb-RPBHD_n51ixHPwxpoSgzF6Su3VvYAfifuqyWgHGyZddg@mail.gmail.com>
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To: Bei Guan <gbtju85@gmail.com>, xen-devel <xen-devel@lists.xen.org>
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On 27/02/14 16:06, Bei Guan wrote:
> Hi,
> 
> I run a PV DomU with 1 vcpu on Xen. I pin the vcpu to a physical CPU
> core, such as core 3. Then, I run a cpu-bound process in DomU and the
> vcpu utilization is 100% (got it with "xentop" in Dom0).
> However, when I use "top" in Dom0 to see the physical CPU utilization,
> the CPU core 3 utilization is zero or less than 1%. The utilization
> expected of CPU core 3 is also 100% like the vcpu. Is it? Why I cannot
> get the accurate physical CPU utilization with "top" command in Dom0?

top in Dom0 will only show CPU utilization of Dom0 (Xen is not a type 2
hypervisor, so Dom0 is no different than any other DomU in this aspect),
if you want to see CPU utilization of all domains you should use xl top
(xentop).

Roger.