Re: [Xen-users] xm vcpu-set won't add cpu's...

[Olivier Hanesse <olivier.hanesse@xxxxxxxxx>]

Hello,

On my debian squeeze, I think I got the same issue.
Starting a server with 4 vcpus (vcpus=4 in config file), I can "vcpu-set" 2 vcpus for this server successfully, but I can't rollback to 4 vcpu.

Xend Log file says : 

[2010-11-24 13:01:23 19542] INFO (XendDomainInfo:1987) Set VCPU count on domain testvm to 2
[2010-11-24 13:01:48 19542] INFO (XendDomainInfo:1987) Set VCPU count on domain testvm to 4

But cpus are offline in domU/paused in dom0.

I also got the "XENBUS: Unable to read cpu state" error.

Regards

Olivier

2010/11/24 Kristoffer Egefelt <dr.fersken@xxxxxxxxx>

Hi list,

I'm trying out Debian Squeeze with XEN 4.0.1 on a Dell m610 blade.
Everything is installed from the squeeze repository, except the dom0
kernel, which would not boot on the m610, so I compiled 2.6.32.25 from
jeremy 11/11-2010.
(http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=summary)

Everything looks good, except these messages, which I've not been able
to explain:

[   16.651781] XENBUS: Unable to read cpu state
[   16.651968] XENBUS: Unable to read cpu state
[   16.652156] XENBUS: Unable to read cpu state
etc...

Removing cpu's work, but when I try to add cpu's:

root@node0106:/# xm vcpu-set 15 15
[2010-11-24 12:22:49 26321] INFO (XendDomainInfo:1987) Set VCPU count
on domain squeezetest01 to 15

but cpu's are still in paused mode:

Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
squeezetest01               15     0    12   -b-      18.9 any cpu
squeezetest01               15     1     4   -b-       0.6 any cpu
squeezetest01               15     2     6   -b-       0.9 any cpu
squeezetest01               15     3    15   -b-       0.8 any cpu
squeezetest01               15     4     8   -b-       0.8 any cpu
squeezetest01               15     5     -   --p       0.1 any cpu
squeezetest01               15     6     -   --p       0.1 any cpu
squeezetest01               15     7     -   --p       0.1 any cpu

This also shows on the VM:

root@squeezetest01:~# cat /sys/devices/system/cpu/offline
5-14

On the VM I've tried both the stock squeeze kernel
linux-image-2.6.32-5-xen-amd64 and jeremys 2.6.32.25 - both have this
problem.

Any ideas are greatly appreciated! ;-)

Regards
Kristoffer

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