[ovirt-users] hot plug memory in el7

[Gianluca Cecchi]

On Thu, Dec 10, 2015 at 10:41 AM, Michal Skrivanek <mskrivan at redhat.com>
wrote:

>
> On 10 Dec 2015, at 00:11, Gianluca Cecchi <gianluca.cecchi at gmail.com>
> wrote:
>
> On Wed, Dec 9, 2015 at 10:21 PM, Sandro Bonazzola  wrote:
>
>>
>>
>> No idea. If it's libvirt issue, can you test
>> http://cbs.centos.org/koji/buildinfo?buildID=4726 ? it's from centos
>> virt sig, introduced for Xen but should work on kvm as well. or the 7.2
>> libvirt from http://mirror.centos.org/centos/7/cr/x86_64/Packages/.
>>
>>
>>
>
> Then I reboot my HV, exit from maintenance, connect to engine and start VM.
> VM situation
> $ free
>               total        used        free      shared  buff/cache
> available
> Mem:        8172900      147356     7875692        8480      149852
> 7847248
> Swap:        839676           0      839676
>
> I set memory from 8192Mb to 10240Mb
> I get the same window I got with previous libvirt version.
> I select OK (I don't select "Apply later" checkbox)
>
> Inside guest there is no changed memory, but I can see this in
> /var/log/messages:
>
>
> could it be perhaps the guest has troubles recognizing hotplug? Is it also
> a CentOS 7.1 guest?
>

Yes, CentOS 7.1 updated up to a couple of days ago.



>
>
> Dec  9 23:56:18 racclient1 kernel: init_memory_mapping: [mem
> 0x240000000-0x2bfffffff]
>
> ANd output of dmesg contains:
>
> [  219.363640] ACPI: \_SB_.MP00: ACPI_NOTIFY_DEVICE_CHECK event
> [  219.364248] init_memory_mapping: [mem 0x240000000-0x2bfffffff]
> [  219.364253]  [mem 0x240000000-0x2bfffffff] page 2M
> [  219.366773]  [ffffea0009000000-ffffea00091fffff] PMD ->
> [ffff8800b7e00000-ffff8800b7ffffff] on node 0
> [  219.368433]  [ffffea0009200000-ffffea00093fffff] PMD ->
> [ffff880231400000-ffff8802315fffff] on node 0
> [  219.369838]  [ffffea0009400000-ffffea00095fffff] PMD ->
> [ffff880233600000-ffff8802337fffff] on node 0
> [  219.371226]  [ffffea0009600000-ffffea00097fffff] PMD ->
> [ffff880233000000-ffff8802331fffff] on node 0
> [  219.372790]  [ffffea0009800000-ffffea00099fffff] PMD ->
> [ffff880232c00000-ffff880232dfffff] on node 0
> [  219.374185]  [ffffea0009a00000-ffffea0009bfffff] PMD ->
> [ffff880232200000-ffff8802323fffff] on node 0
> [  219.377349]  [ffffea0009c00000-ffffea0009ffffff] PMD ->
> [ffff8800b7400000-ffff8800b77fffff] on node 0
> [  219.378716]  [ffffea000a000000-ffffea000a1fffff] PMD ->
> [ffff8800b7000000-ffff8800b71fffff] on node 0
> [  219.380115]  [ffffea000a200000-ffffea000a3fffff] PMD ->
> [ffff880230c00000-ffff880230dfffff] on node 0
> [  219.388147]  [ffffea000a400000-ffffea000abfffff] PMD ->
> [ffff880227c00000-ffff8802283fffff] on node 0
> [  219.389687]  [ffffea000ac00000-ffffea000adfffff] PMD ->
> [ffff8800b7200000-ffff8800b73fffff] on node 0
>
>
> but “free” sstill shows the same value as before hotplug?
>


Yes, output of "free" command show the same amount of memory



>
>
> I then shutdown the VM and power on it again and I get the changed memory:
>
>
> well, yeah, but that doesn’t count since you’ve shut it down, so the next
> run is initialized with 10GB
>
>
It was only to verify that after shutdown/power on the changed setting
would have been applied to the VM


> $ free
>               total        used        free      shared  buff/cache
> available
> Mem:       10237276      167872     9919656        8480      149748
> 9891280
> Swap:        839676           0      839676
>
> BTW: When I press ok in the gui for memory increase I get these events in
> webadmin:
> Dec 9, 2015 11:56:22 PM
> VM racclient1 c71_Disk1_newtemplate disk was updated by admin at internal.
>
>
> hm..doesn’t sound right. Did the confirmation window show any more fields
> as changed other than memory?
>

The window I got when I increased the amount of memory was the same as in a
previous test where I selected "Cancel", before libvirt update; see
https://drive.google.com/file/d/0BwoPbcrMv8mvbUw2VnpCMTNNQlU/view?usp=sharing

And I also commented about misleading information inside it: I didn't
clearly understand what would have been changed and what not, because I see
memory information in both parts.....

>
>
> It doesn't seem as expected, does it?
>
>
> I think we’re almost there. Just need to figure out what happened in the
> guest. I would suspect a problem there
>
> Thanks,
> michal
>
> Gianluca
>
>
>

The gui events have the same timestamp of the moment when I pressed ok.
After 2-3 minutes I did shutdown and power on of the VM and I only got the
down/up events...
I'm available to make further test you need.

GIanluca
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