[Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Alexandre DERUMIER]

Hi,

I'm currently testing cpu hotplug with a windows 2012R2 standard guest,

and I can't get it too work. (works fine with linux guest).

host kernel : rhel7 3.10 kernel
qemu 2.2


qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2

Started with 1cpu, topogoly is 2sockets with 1cores.


Then

qmp# cpu-add 1


I can see a new cpu is windows device manager, and event log in the device said that it's online.

So it should be ok, but.

I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.).


So, it is a windows bug ? Does I need to do something else ?

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Andrey Korolyov]

On Fri, Jan 9, 2015 at 1:26 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote:
> Hi,
>
> I'm currently testing cpu hotplug with a windows 2012R2 standard guest,
>
> and I can't get it too work. (works fine with linux guest).
>
> host kernel : rhel7 3.10 kernel
> qemu 2.2
>
>
> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2
>
> Started with 1cpu, topogoly is 2sockets with 1cores.
>
>
> Then
>
> qmp# cpu-add 1
>
>
> I can see a new cpu is windows device manager, and event log in the device said that it's online.
>
> So it should be ok, but.
>
> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.).
>
>
> So, it is a windows bug ? Does I need to do something else ?
>

Did you populated appropriate topology in arguments? As far as I can
remember from pre-1.1 era CPU hotplug not worked with windows, so it
should be neither lack of configured NUMA or a simply OS-specific
issue.

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Andrey Korolyov]

On Fri, Jan 9, 2015 at 4:35 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
> On Fri, Jan 9, 2015 at 1:26 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote:
>> Hi,
>>
>> I'm currently testing cpu hotplug with a windows 2012R2 standard guest,
>>
>> and I can't get it too work. (works fine with linux guest).
>>
>> host kernel : rhel7 3.10 kernel
>> qemu 2.2
>>
>>
>> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2
>>
>> Started with 1cpu, topogoly is 2sockets with 1cores.
>>
>>
>> Then
>>
>> qmp# cpu-add 1
>>
>>
>> I can see a new cpu is windows device manager, and event log in the device said that it's online.
>>
>> So it should be ok, but.
>>
>> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.).
>>
>>
>> So, it is a windows bug ? Does I need to do something else ?
>>
>
> Did you populated appropriate topology in arguments? As far as I can
> remember from pre-1.1 era CPU hotplug not worked with windows, so it
> should be neither lack of configured NUMA or a simply OS-specific
> issue.

Just to let anyone know that it works well:

http://xdel.ru/downloads/windows-hotplugged-cpu.png

Topology is a bit rotten (I have two sockets with single CPU in each)
and I *need* to specify non-zero amount of memory for each numa node
to be seen, if each CPU belongs to different node for example but
everything else is just fine.

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Alexandre DERUMIER]

>> I *need* to specify non-zero amount of memory for each numa node
>>to be seen, if each CPU belongs to different node for example but
>>everything else is just fine.

Ok, thanks I'll try to enable numa to see if it's helping

(I known that numa is mandatory for memory hotplug, maybe for cpu too)

----- Mail original -----
De: "Andrey Korolyov" <andrey@xdel.ru>
À: "aderumier" <aderumier@odiso.com>
Cc: "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Mercredi 14 Janvier 2015 17:07:41
Objet: Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

On Fri, Jan 9, 2015 at 4:35 PM, Andrey Korolyov <andrey@xdel.ru> wrote: 
> On Fri, Jan 9, 2015 at 1:26 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote: 
>> Hi, 
>> 
>> I'm currently testing cpu hotplug with a windows 2012R2 standard guest, 
>> 
>> and I can't get it too work. (works fine with linux guest). 
>> 
>> host kernel : rhel7 3.10 kernel 
>> qemu 2.2 
>> 
>> 
>> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2 
>> 
>> Started with 1cpu, topogoly is 2sockets with 1cores. 
>> 
>> 
>> Then 
>> 
>> qmp# cpu-add 1 
>> 
>> 
>> I can see a new cpu is windows device manager, and event log in the device said that it's online. 
>> 
>> So it should be ok, but. 
>> 
>> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.). 
>> 
>> 
>> So, it is a windows bug ? Does I need to do something else ? 
>> 
> 
> Did you populated appropriate topology in arguments? As far as I can 
> remember from pre-1.1 era CPU hotplug not worked with windows, so it 
> should be neither lack of configured NUMA or a simply OS-specific 
> issue. 

Just to let anyone know that it works well: 

http://xdel.ru/downloads/windows-hotplugged-cpu.png 

Topology is a bit rotten (I have two sockets with single CPU in each) 
and I *need* to specify non-zero amount of memory for each numa node 
to be seen, if each CPU belongs to different node for example but 
everything else is just fine. 

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Andrey Korolyov]

BTW both 2008r2 and 2012r2 are supporting this. 2008r2 is kind enough
to tell me that the cpu count is changed and I should relaunch task
manager.

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Alexandre DERUMIER]

Hi,

I have tried with numa enabled, and it's still don't work.
Can you send me your vm qemu command line ?


Also, with numa I have notice something strange with "info numa" command.

starting with -smp socket=2,cores=1

# info numa
2 nodes
node 0 cpus: 0
node 0 size: 2048 MB
node 1 cpus: 1
node 1 size: 2048 MB

ok


now:

starting with -smp 1,socket=2,cores=1,maxcpus=2

# info numa
2 nodes
node 0 cpus: 0
node 0 size: 2048 MB
node 1 cpus:
node 1 size: 2048 MB

ok


now hotplug cpu

# cpu-add 1
# info numa
2 nodes
node 0 cpus: 0 1
node 0 size: 2048 MB
node 1 cpus:
node 1 size: 2048 MB


cpu1 has been hotplugged on numa node0 ??????


----- Mail original -----
De: "Andrey Korolyov" <andrey@xdel.ru>
À: "aderumier" <aderumier@odiso.com>
Cc: "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Mercredi 14 Janvier 2015 17:07:41
Objet: Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

On Fri, Jan 9, 2015 at 4:35 PM, Andrey Korolyov <andrey@xdel.ru> wrote: 
> On Fri, Jan 9, 2015 at 1:26 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote: 
>> Hi, 
>> 
>> I'm currently testing cpu hotplug with a windows 2012R2 standard guest, 
>> 
>> and I can't get it too work. (works fine with linux guest). 
>> 
>> host kernel : rhel7 3.10 kernel 
>> qemu 2.2 
>> 
>> 
>> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2 
>> 
>> Started with 1cpu, topogoly is 2sockets with 1cores. 
>> 
>> 
>> Then 
>> 
>> qmp# cpu-add 1 
>> 
>> 
>> I can see a new cpu is windows device manager, and event log in the device said that it's online. 
>> 
>> So it should be ok, but. 
>> 
>> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.). 
>> 
>> 
>> So, it is a windows bug ? Does I need to do something else ? 
>> 
> 
> Did you populated appropriate topology in arguments? As far as I can 
> remember from pre-1.1 era CPU hotplug not worked with windows, so it 
> should be neither lack of configured NUMA or a simply OS-specific 
> issue. 

Just to let anyone know that it works well: 

http://xdel.ru/downloads/windows-hotplugged-cpu.png 

Topology is a bit rotten (I have two sockets with single CPU in each) 
and I *need* to specify non-zero amount of memory for each numa node 
to be seen, if each CPU belongs to different node for example but 
everything else is just fine. 

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Andrey Korolyov]

On Tue, Jan 20, 2015 at 10:06 PM, Alexandre DERUMIER
<aderumier@odiso.com> wrote:
> Hi,
>
> I have tried with numa enabled, and it's still don't work.
> Can you send me your vm qemu command line ?
>
>
> Also, with numa I have notice something strange with "info numa" command.
>
> starting with -smp socket=2,cores=1
>
> # info numa
> 2 nodes
> node 0 cpus: 0
> node 0 size: 2048 MB
> node 1 cpus: 1
> node 1 size: 2048 MB
>
> ok
>
>
> now:
>
> starting with -smp 1,socket=2,cores=1,maxcpus=2
>
> # info numa
> 2 nodes
> node 0 cpus: 0
> node 0 size: 2048 MB
> node 1 cpus:
> node 1 size: 2048 MB
>
> ok
>
>
> now hotplug cpu
>
> # cpu-add 1
> # info numa
> 2 nodes
> node 0 cpus: 0 1
> node 0 size: 2048 MB
> node 1 cpus:
> node 1 size: 2048 MB
>
>
> cpu1 has been hotplugged on numa node0 ??????
>
>

http://lists.gnu.org/archive/html/qemu-devel/2015-01/msg02240.html
here are working examples. Yes, everything goes to the node0 unless
specified (you can see an example for bounded sockets in this url
too).

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Alexandre DERUMIER]

Ok,
I think it's a windows bug,
I have the same topology than you, I don't work.
(I see the new vcpu in device manager, but not in taskmgr or perform)

Rebooting the os make the new vcpu display, so it's seem to be ok on qemu side.


(Just to known, which version of win2012r2 do you use ? standard or datacenter ?)


Thanks for your help!

Regards,

Alexandre
----- Mail original -----
De: "Andrey Korolyov" <andrey@xdel.ru>
À: "aderumier" <aderumier@odiso.com>
Cc: "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Mercredi 21 Janvier 2015 00:16:45
Objet: Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

On Tue, Jan 20, 2015 at 10:06 PM, Alexandre DERUMIER 
<aderumier@odiso.com> wrote: 
> Hi, 
> 
> I have tried with numa enabled, and it's still don't work. 
> Can you send me your vm qemu command line ? 
> 
> 
> Also, with numa I have notice something strange with "info numa" command. 
> 
> starting with -smp socket=2,cores=1 
> 
> # info numa 
> 2 nodes 
> node 0 cpus: 0 
> node 0 size: 2048 MB 
> node 1 cpus: 1 
> node 1 size: 2048 MB 
> 
> ok 
> 
> 
> now: 
> 
> starting with -smp 1,socket=2,cores=1,maxcpus=2 
> 
> # info numa 
> 2 nodes 
> node 0 cpus: 0 
> node 0 size: 2048 MB 
> node 1 cpus: 
> node 1 size: 2048 MB 
> 
> ok 
> 
> 
> now hotplug cpu 
> 
> # cpu-add 1 
> # info numa 
> 2 nodes 
> node 0 cpus: 0 1 
> node 0 size: 2048 MB 
> node 1 cpus: 
> node 1 size: 2048 MB 
> 
> 
> cpu1 has been hotplugged on numa node0 ?????? 
> 
> 

http://lists.gnu.org/archive/html/qemu-devel/2015-01/msg02240.html 
here are working examples. Yes, everything goes to the node0 unless 
specified (you can see an example for bounded sockets in this url 
too). 

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Igor Mammedov]

On Fri, 9 Jan 2015 11:26:08 +0100 (CET)
Alexandre DERUMIER <aderumier@odiso.com> wrote:

> Hi,
> 
> I'm currently testing cpu hotplug with a windows 2012R2 standard guest,
> 
> and I can't get it too work. (works fine with linux guest).
> 
> host kernel : rhel7 3.10 kernel
> qemu 2.2
> 
> 
> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2
> 
> Started with 1cpu, topogoly is 2sockets with 1cores.
> 
> 
> Then
> 
> qmp# cpu-add 1
> 
> 
> I can see a new cpu is windows device manager, and event log in the device said that it's online.
> 
> So it should be ok, but.
> 
> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.).
> 
> 
> So, it is a windows bug ? Does I need to do something else ?
it might be a limitation of specific Windows edition,
I've tested it with W2012R2 Datacenter edition where it's supported for sure.

> 
> 
> 
> 
> 
> 
> 

Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

[Alexandre DERUMIER]

>>it might be a limitation of specific Windows edition,
>>I've tested it with W2012R2 Datacenter edition where it's supported for sure.

>From the ovirt documentation:

http://www.ovirt.org/Hot_plug_cpu

It should work with any win2012 version. 
(Indeed for win2008, datacenter edition was needed)


----- Mail original -----
De: "Igor Mammedov" <imammedo@redhat.com>
À: "aderumier" <aderumier@odiso.com>
Cc: "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Lundi 19 Janvier 2015 17:06:37
Objet: Re: [Qemu-devel] cpu hotplug and windows guest (win2012r2)

On Fri, 9 Jan 2015 11:26:08 +0100 (CET) 
Alexandre DERUMIER <aderumier@odiso.com> wrote: 

> Hi, 
> 
> I'm currently testing cpu hotplug with a windows 2012R2 standard guest, 
> 
> and I can't get it too work. (works fine with linux guest). 
> 
> host kernel : rhel7 3.10 kernel 
> qemu 2.2 
> 
> 
> qemu command line : -smp cpus=1,sockets=2,cores=1,maxcpus=2 
> 
> Started with 1cpu, topogoly is 2sockets with 1cores. 
> 
> 
> Then 
> 
> qmp# cpu-add 1 
> 
> 
> I can see a new cpu is windows device manager, and event log in the device said that it's online. 
> 
> So it should be ok, but. 
> 
> I can't see new processor in taskmanager or perfmon. (I had tried to relaunch them to be sure.). 
> 
> 
> So, it is a windows bug ? Does I need to do something else ? 
it might be a limitation of specific Windows edition, 
I've tested it with W2012R2 Datacenter edition where it's supported for sure. 

> 
> 
> 
> 
> 
> 
>