Re: [Xen-users] how do i confirm my new second CPU

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello.

El 10/07/13 11:42, simon ben escribió:
> Dear All,
>
> I had a Centos 5.8 server running xen 3.1.2-194.el5 for quite sometime
> and working fine
>
> i have just added a second cpu but am confused since the different
> utilities to check for the presence of the new installed CPU is conflicting
>
> what i mean is running cat /proc/cpuinfo shows one cpu
That shows how many CPU's are visible for Dom0. Normally, the default is 
the number of PCPUs, but obviously it's not your case. This is 
controlled via xen boot command line options, can't think of a reason 
why this value is not on it's defaults.
http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html

> xm info show 2 cpus that is 2*8
xm extracts data directly from Xen hypervisor, who can see all the CPUs.

> how do i correctly check and be confirmed that my linux xen server is
> using both Cpus.
> i have already assigned VM to the cores on the second cpu and everything
> is working fine
> but jus wanted to confirm.
IMHO, xm and xentop output should be enough.

To be sure sure sure, you may try to pin specific cores to specific 
DomU's, using all 16 CPUs visible. If you happen to find a CPU that is 
not truly available, a DomU won't be created anf you would get an error. 
You probably would also be able to see, how the DomU's that shares the 
same physical core (visible as 2 due to HT) interfere with each other on 
CPU consumption.
Greetings.

--
Alexandre Kouznetsov


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