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RE: [Xen-users] pin cpu 0 to dom0.

To: "Mauro" <mrsanna1@xxxxxxxxx>,"J. Roeleveld" <joost@xxxxxxxxxxxx>
Subject: RE: [Xen-users] pin cpu 0 to dom0.
From: "Robert Dunkley" <Robert@xxxxxxxxx>
Date: Fri, 4 Jun 2010 12:41:56 +0100
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Thread-topic: [Xen-users] pin cpu 0 to dom0.
Maybe things are different in Debian but the following does correctly pin the 
first 2 cores to Dom0 for me:

title CentOS (2.6.18-92.1.6.el5xen331)
        root (hd0,0)
        kernel /xen.gz-3.3.1 apic_verbosity=debug dom0_mem=4096M 
dom0_max_vcpus=2 acpi=on numa=on cpufreq=dom0-kernel
        module /vmlinuz-2.6.18-92.1.6.el5xen ro root=/dev/VolGroup00/LogVol00
        module /initrd-2.6.18-92.1.6.el5xen.img

(dom0-min-mem 0)
(dom0-cpus 2)

xm vcpu-list:
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0     0   -b-  3035828.2 0
Domain-0                             0     1     1   r--  1384542.3 1

The min-mem setting disables dom0 memory ballooning, its definitely recommended 
in NUMA type configs.


-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Mauro
Sent: 04 June 2010 12:28
To: J. Roeleveld
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] pin cpu 0 to dom0.

On 4 June 2010 13:23, J. Roeleveld <joost@xxxxxxxxxxxx> wrote:
> On Friday 04 June 2010 13:12:40 Robert Dunkley wrote:
>> Hi,
>> First try setting the option in xend-config:
>> vi /etc/xen/xend-config.sxp  -  set “(dom0-min-mem 0)” and set “(dom0-cpus
>>  1)”
> NOTE: Please ignore this advice.
> The setting in the "xend-config.sxp" is ignored. (Tried it and it doesn't 
> work)
> Setting “(dom0-min-mem 0)” is not a good idea, this allows the dom0 to loose
> ALL memory.

I've (dom0-min-mem 196)

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