[libvirt-users] HugePages - can't start guest that requires them

[Dominique Ramaekers]

Did you create a mount for the hugepages? If you did, that's maybe the problem. I did that also at first but with libvirt it isn't necessary and in my case, it broke hugepages...

If I'm not mistaking, libvirt takes care of the hugepages mount.

A while ago, I've written a wiki to use hugepages in libvirt and Ubuntu. https://help.ubuntu.com/community/KVM%20-%20Using%20Hugepages

Maybe this helps?

________________________________________
Van: G. Richard Bellamy [rbellamy at pteradigm.com]
Verzonden: zaterdag 31 januari 2015 0:33
Aan: libvirt-users at redhat.com
Onderwerp: [libvirt-users] HugePages - can't start guest that requires them

Hello All,

I'm trying to enable hugepages, I've turned off THP (Transparent Huge
Pages), and enabled hugepages in memoryBacking, and set my 2MB
hugepages count via sysctl.

I'm getting "libvirtd[5788]: Failed to autostart VM 'atlas': internal
error: Unable to find any usable hugetlbfs mount for 16777216 KiB"
where atlas is one of my guests and 16777216 KiB is the amount of
memory I'm trying to give to the guest.

Yes, i can see the hugepages via numastat -m and hugetlbfs is mounted
via /dev/hugepages and there is a dir structure
/dev/hugepages/libvirt/qemu (it's empty).

HugePages is big enough to accommodate the 16G i'm allocating... and
changing the perms on that directory structure to 777 doesn't work
either.

Any help is much appreciated.

HOST: http://sprunge.us/SEdc
GUEST: http://sprunge.us/VCYB

Regards,
Richard

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