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

[G. Richard Bellamy]

ack. Yeah, I had seen that and thought I corrected it. Thank you very much,
the instances start.

Now I just have to figure out why I seem to be using 2x the number of
hugepages I think I should be. Numstat seems to think that now that I've
started up the two VMs, I am using twice as many hugepages as the amount I
had allocated via sysctl [1].

[1] http://sprunge.us/LLNM

On Sat, Jan 31, 2015 at 9:55 AM, Martin Kletzander <mkletzan at redhat.com>
wrote:

> On Fri, Jan 30, 2015 at 03:33:43PM -0800, G. Richard Bellamy wrote:
>
>> 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.
>>
>>
> Looking at the XML:
>
>  <memoryBacking>
>    <hugepages>
>      <page size='16777216' unit='KiB' nodeset='0'/>
>
> This means you want the guest's memory to be allocated from 16GiB
> hugepages.  You probably wanted to put this there:
>
>  <page size='2' unit='MiB' ...
>
>  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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>>
>
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