[ovirt-users] Huge pages in guest with newer oVirt versions

[Martin Polednik]

The hugepages are no longer a hook, but part of the code base. They
can be configured via engine property `hugepages`, where the value of
property is size of the pages in KiB (1048576 = 1G, 2048 = 2M).
Specifying any other size not supported by the architecture (or just
"1") will use platform's default hugepage size.

On Mon, Sep 18, 2017 at 11:39 AM, Gianluca Cecchi
<gianluca.cecchi at gmail.com> wrote:
> Hello,
> I would like to go again in deep with what preliminary tested and already
> discussed here:
>
> http://lists.ovirt.org/pipermail/users/2017-April/081320.html
>
> I'm testing an oVirt node in 4.1.6-pre
>
> I don't find the vdsm hook for huge pages; doing a search I get these:
>
> vdsm-hook-ethtool-options.noarch : Allow setting custom ethtool options for
> vdsm controlled nics
> vdsm-hook-fcoe.noarch : Hook to enable FCoE support
> vdsm-hook-openstacknet.noarch : OpenStack Network vNICs support for VDSM
> vdsm-hook-vfio-mdev.noarch : Hook to enable mdev-capable devices.
> vdsm-hook-vhostmd.noarch : VDSM hook set for interaction with vhostmd
> vdsm-hook-vmfex-dev.noarch : VM-FEX vNIC support for VDSM
>
> Did anything change between 4.1.1 and 4.1.5/4.1.6?
>
> I'm making preliminary tests with an Oracle RDBMS and HammerDB in both a
> physical server and a "big" VM inside another same hw server configured with
> oVirt.
>
> Results are not bad, but I would like to see having huge pages inside the
> guest how could change results.
>
> Just for reference:
>
> The 2 Physical server are blades with each one:
> 2 sockets, each one with 14 cores and ht enabled, so in total 56
> computational threads
> 256Gb ram
> huge pages enabled
>
> VM configured with this virtual hw on one of them:
> 2 sockets, each one with 6 cores and ht so in total 24 computational threads
> 64Gb ram
> no huge pages at the moment
>
> Oracle SGA is 32Gb on both physical rdbms and virtual one.
>
> Thanks for any insight to test huge pages in guest
>
> Gianluca
>
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