Hi,

the hugepages configuration has two aspects - hugepage size and count. You can have multiple sizes at the same time. I am not sure what the recommended configuration is or how to pass it to kernel so others will have to help here (I think 2M and 1G are the usual sizes).

The VM memory configuration is then taken from two places. The custom property tells oVirt which size of hugepages you want to use (in KiB iirc) and the actual number of used hugepages is computed from the total memory configured for the VM at the usual place (it has to be a multiple of the selected hugepage size).

One of our colleagues wrote a blog post about this: https://mpolednik.github.io/2017/06/26/hugepages-and-ovirt/

Best regards

Martin Sivak

On Fri, Feb 15, 2019 at 5:35 AM Vincent Royer <vincent@epicenergy.ca> wrote:
How do I know how many huge pages my hosts can support?

cat /proc/meminfo | grep Huge
 AnonHugePages:  17684480 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB 

image.png

And once I know, I set the kernel parameters here, and reboot the host, correct?

image.png


And then I assume I assign them to the VM here?  How do I decide how many huge pages and what size a particular VM can benefit from?

image.png


Is there a part of the docs I am not finding that covers this?
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