[ovirt-devel] NUMA-support oVirt scheduler intergation design

Gilad Chaplik gchaplik at redhat.com
Sun Jun 8 18:23:28 UTC 2014


After some thinking, since memory weights aren't supported yet in the scheduler,
I will exclude weights for now (will add a RFE for NUMA weights that will depend on Memory weights RFE).

Also, to avoid several memory filters, will extend current memory filter to support pinned virtual (guest) NUMA nodes
(filter out hosts that cannot accommodate memory of VM's pinned virtual NUMA nodes within a host's physical NUMA nodes).

Please review the patch: http://gerrit.ovirt.org/#/c/28467/


----- Original Message -----
> From: "Gilad Chaplik" <gchaplik at redhat.com>
> To: "Doron Fediuck" <dfediuck at redhat.com>, devel at ovirt.org
> Cc: "Shang-Chun Liang (David Liang, HPservers-Core-OE-PSC)" <shangchun.liang at hp.com>, "Chegu Vinod"
> <chegu_vinod at hp.com>, "Xiao-Lei Shi (Bruce, HP Servers-PSC-CQ)" <xiao-lei.shi at hp.com>, "Chuan Liao (Jason Liao,
> HPservers-Core-OE-PSC)" <chuan.liao at hp.com>
> Sent: Wednesday, June 4, 2014 1:23:48 PM
> Subject: NUMA-support oVirt scheduler intergation design
> Hi List,
> This is the design for NUMA-support oVirt Scheduler integration; I'll add 3
> policy unit modules (#) as described in following document:
> (1) Filter Module: NUMA_HostFilter:
> If the VM has NUMA vNodes/pinning configured, and the rule can't be
> accommodated on the host, it'd filtered.
> * pin2host filter should make sure the filter gets a single host. the
> filter should be transparent to specific hosts.
> * not sure we'll want to add this filter in first phase to all
> cluster/scheduling policies; @Doron?
> Weights Modules:
> (2) even_dest_NUMA
> Should "even distribute" weights (scores) according to:
> * Available memory on nodes
> * Numatune memory mode (strict/preferred/interleave)
> * Autonuma/pinned NUMA
> (3) power_saving_NUMA (added to power_saving cluster/scheduling policy)
> * same as even_dest_NUMA with opposite weights.
> I'd appreciate any comment or suggestion.
> Once approved by you, I'll update the feature page and upload a patch for
> review.
> Thanks,
> Gilad.

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