[ovirt-users] Re: NUMA Pinning bug with Hugepages?

2020-04-15 Thread klaasdemter 

Hi,
I asked about a backport to 4.3, but this won't happen according to 
support. You should be aware that there are more issues with hugepages 
and 4.3:


https://access.redhat.com/solutions/4904441
https://bugzilla.redhat.com/show_bug.cgi?id=1804037
https://bugzilla.redhat.com/show_bug.cgi?id=1804046
https://bugzilla.redhat.com/show_bug.cgi?id=1812316
https://bugzilla.redhat.com/show_bug.cgi?id=1806339
https://bugzilla.redhat.com/show_bug.cgi?id=1785507

Greetings
Klaas

On 15.04.20 13:42, Alan G wrote:

Will this be fixed in 4.3 or only 4.4?

Thanks,

Alan


 On Wed, 15 Apr 2020 12:37:38 +0100 *Lucia Jelinkova 
* wrote 


Hi,


I think you've hit similar issue as reported here:

https://bugzilla.redhat.com/show_bug.cgi?id=1812316

You're right, the hugepages are considered as allocated memory and
it is a bug. I am working on a fix right now.

Regards,

Lucia

On Wed, Apr 15, 2020 at 1:21 PM Alan G mailto:alan%2bov...@griff.me.uk>> wrote:

Hi,

I seem to have found an issue when trying to setup a high
performance VM utilising hugepages and NUMA pinning.

The VM is configured for 32GB RAM and uses hugepages of size 1G.

The host has two NUMA nodes each having 64GB RAM (for 128GB
total system RAM).

No other VMs are running or otherwise pinned to the host.

The VM is pinned to node 0. And the required hugepages are
allocated with

echo 32 >

/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages

I then attempt to start the VM and get a pop-up error saying
"cannot accommodate memory of VM's pinned virtual NUMA nodes
within host's physical NUMA nodes".

However, if I remove the hugepages from node 0

echo 0 >

/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages

Start the VM and then immediately re-create the hugepqages
then everything works as expected.

It seems to me that oVirt is considering the hugepages as
allocated memory even if they are not in use.

Is this correct?

Thanks,

Alan

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[ovirt-users] Re: NUMA Pinning bug with Hugepages?

2020-04-15 Thread Alan G 
Will this be fixed in 4.3 or only 4.4?



Thanks,



Alan



 On Wed, 15 Apr 2020 12:37:38 +0100 Lucia Jelinkova  
wrote 


Hi, 





I think you've hit similar issue as reported here:



https://bugzilla.redhat.com/show_bug.cgi?id=1812316



You're right, the hugepages are considered as allocated memory and it is a bug. 
I am working on a fix right now. 



Regards, 



Lucia



On Wed, Apr 15, 2020 at 1:21 PM Alan G  wrote:





Hi,



I seem to have found an issue when trying to setup a high performance VM 
utilising hugepages and NUMA pinning.



The VM is configured for 32GB RAM and uses hugepages of size 1G.



The host has two NUMA nodes each having 64GB RAM (for 128GB total system RAM).



No other VMs are running or otherwise pinned to the host.



The VM is pinned to node 0. And the required hugepages are allocated with



echo 32 > 
/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages



I then attempt to start the VM and get a pop-up error saying "cannot 
accommodate memory of VM's pinned virtual NUMA nodes within host's physical 
NUMA nodes".



However, if I remove the hugepages from node 0 



echo 0 > 
/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages



Start the VM and then immediately re-create the hugepqages then everything 
works as expected.



It seems to me that oVirt is considering the hugepages as allocated memory even 
if they are not in use.



Is this correct?



Thanks,



Alan




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[ovirt-users] Re: NUMA Pinning bug with Hugepages?

2020-04-15 Thread Lucia Jelinkova 
Hi,

I think you've hit similar issue as reported here:

https://bugzilla.redhat.com/show_bug.cgi?id=1812316

You're right, the hugepages are considered as allocated memory and it is a
bug. I am working on a fix right now.

Regards,

Lucia

On Wed, Apr 15, 2020 at 1:21 PM Alan G  wrote:

> Hi,
>
> I seem to have found an issue when trying to setup a high performance VM
> utilising hugepages and NUMA pinning.
>
> The VM is configured for 32GB RAM and uses hugepages of size 1G.
>
> The host has two NUMA nodes each having 64GB RAM (for 128GB total system
> RAM).
>
> No other VMs are running or otherwise pinned to the host.
>
> The VM is pinned to node 0. And the required hugepages are allocated with
>
> echo 32 >
> /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages
>
> I then attempt to start the VM and get a pop-up error saying "cannot
> accommodate memory of VM's pinned virtual NUMA nodes within host's physical
> NUMA nodes".
>
> However, if I remove the hugepages from node 0
>
> echo 0 >
> /sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages
>
> Start the VM and then immediately re-create the hugepqages then everything
> works as expected.
>
> It seems to me that oVirt is considering the hugepages as allocated memory
> even if they are not in use.
>
> Is this correct?
>
> Thanks,
>
> Alan
>
> ___
> Users mailing list -- users@ovirt.org
> To unsubscribe send an email to users-le...@ovirt.org
> Privacy Statement: https://www.ovirt.org/privacy-policy.html
> oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
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> https://lists.ovirt.org/archives/list/users@ovirt.org/message/32QKZ2EQ5OKTMPJD4M6W7QK2FKFDFK2E/
>
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