On a SMP system this normally means that you use 300% out of 800%.
However, note that as far as I understand, Xentop shows "virtual" CPU
(VCPU) usage. So the numbers will vary depending on how you have configured your
DomU with VCPUs and how these run on actual physical CPUs. For example, if you
run two domains which are configured with a single VCPU each, then it might be
that Xentop shows 100% CPU usage for both domains if they run on different
physical CPUs, but only up to 50% each if they run on the same physical CPU. You
can see the assignment of physical CPUs with the xm vcpu-list command.
Also, I would recommend to use XenMon for measuring CPU utilization on a Xen
system. Have a look at this:
http://lists.xensource.com/archives/html/xen-tools/2005-10/msg00001.html
________________________________
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Kyrios
Sent: 05 September 2007 12:53
To: xen-users@lists.xensource.com
Subject: [Xen-users] Re: xentop CPU Usage
Hi again list,
does anyone know something about this topic?
We have 4 hosts with 8 CPU Cores each. We have some performance problems and
don''t know if it is a CPU Utilization problem. For example one of the
hosts has (accumulated) 300% CPU usage in Xentop (xm top). Does this mean
it''s 3 times to much or does it mean it uses 300% of 800% available?
Bye
Thorsten
On 7/15/07, Kyrios <kyrios@gmail.com> wrote:
Hi list,
when xentop says cpu Usage für domU ist 20% what does that exactly mean on a
multi cpu machine. Does it mean that one of the CPUs is used by 20% or does it
mean the domU uses 20% off all available CPU time?
Bye
Thorsten
--
... black holes are where god divided by zero.
--
... black holes are where god divided by zero.
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