oVirt hook to manage physical CPU pool, and automatically pin CPUs without overlap on the host
Hi All Thanks for the help that people have recently provided on this list. I'm running into another edge case that, as far as I can see, does not have a native solution within oVirt. I have a use case where every VM must have 4 pinned vCPUs, and these must map 1:1 to physical CPUs so that there are never two VMs contending for the same physical cores. I already have code in place that ensures a VM will not be created or started if n/4 VMs are already running on the target host, where n is the number of physical cores. What I need now is to ensure that pinning is managed so that each physical core maps 1:1 to vCPUs. Would it be possible to manage the pool of physical cores in a local DB, and implement a VDSM hook similar to the example on this page? http://www.ovirt.org/VDSM-Hooks Or would there be a preferable solution? Thanks David
Please look at the NUMA feature to enable you to pin a VM to a CPU group. Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: ydary@redhat.com IRC : ydary On Mon, Feb 1, 2016 at 9:21 AM, David Jorm <djorm@iix.net> wrote:
Hi All
Thanks for the help that people have recently provided on this list. I'm running into another edge case that, as far as I can see, does not have a native solution within oVirt. I have a use case where every VM must have 4 pinned vCPUs, and these must map 1:1 to physical CPUs so that there are never two VMs contending for the same physical cores. I already have code in place that ensures a VM will not be created or started if n/4 VMs are already running on the target host, where n is the number of physical cores. What I need now is to ensure that pinning is managed so that each physical core maps 1:1 to vCPUs.
Would it be possible to manage the pool of physical cores in a local DB, and implement a VDSM hook similar to the example on this page?
http://www.ovirt.org/VDSM-Hooks
Or would there be a preferable solution?
Thanks David _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Is the NUMA feature complete in 3.6? I see it in the UI, but got lost looking for any documentation or examples. David On 02/02/2016 7:40 PM, "Yaniv Dary" <ydary@redhat.com> wrote:
Please look at the NUMA feature to enable you to pin a VM to a CPU group.
Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 8272306 Email: ydary@redhat.com IRC : ydary
On Mon, Feb 1, 2016 at 9:21 AM, David Jorm <djorm@iix.net> wrote:
Hi All
Thanks for the help that people have recently provided on this list. I'm running into another edge case that, as far as I can see, does not have a native solution within oVirt. I have a use case where every VM must have 4 pinned vCPUs, and these must map 1:1 to physical CPUs so that there are never two VMs contending for the same physical cores. I already have code in place that ensures a VM will not be created or started if n/4 VMs are already running on the target host, where n is the number of physical cores. What I need now is to ensure that pinning is managed so that each physical core maps 1:1 to vCPUs.
Would it be possible to manage the pool of physical cores in a local DB, and implement a VDSM hook similar to the example on this page?
http://www.ovirt.org/VDSM-Hooks
Or would there be a preferable solution?
Thanks David _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
It is, check out the feature page: http://www.ovirt.org/Features/NUMA_and_Virtual_NUMA Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109 Tel : +972 (9) 7692306 8272306 Email: ydary@redhat.com IRC : ydary On Tue, Feb 2, 2016 at 11:58 AM, David Jorm <djorm@iix.net> wrote:
Is the NUMA feature complete in 3.6? I see it in the UI, but got lost looking for any documentation or examples.
David On 02/02/2016 7:40 PM, "Yaniv Dary" <ydary@redhat.com> wrote:
Please look at the NUMA feature to enable you to pin a VM to a CPU group.
Yaniv Dary Technical Product Manager Red Hat Israel Ltd. 34 Jerusalem Road Building A, 4th floor Ra'anana, Israel 4350109
Tel : +972 (9) 7692306 8272306 Email: ydary@redhat.com IRC : ydary
On Mon, Feb 1, 2016 at 9:21 AM, David Jorm <djorm@iix.net> wrote:
Hi All
Thanks for the help that people have recently provided on this list. I'm running into another edge case that, as far as I can see, does not have a native solution within oVirt. I have a use case where every VM must have 4 pinned vCPUs, and these must map 1:1 to physical CPUs so that there are never two VMs contending for the same physical cores. I already have code in place that ensures a VM will not be created or started if n/4 VMs are already running on the target host, where n is the number of physical cores. What I need now is to ensure that pinning is managed so that each physical core maps 1:1 to vCPUs.
Would it be possible to manage the pool of physical cores in a local DB, and implement a VDSM hook similar to the example on this page?
http://www.ovirt.org/VDSM-Hooks
Or would there be a preferable solution?
Thanks David _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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