Hi Daniel,
Can we have this patch for now ? Or should it come along with
multiple-phb support ?
Thanks,
Shivaprasad
On 11/08/2016 07:40 PM, Shivaprasad G Bhat wrote:
On 11/08/2016 05:59 PM, Daniel P. Berrange wrote:
That doesn't really solve the bug above properly - your solution here
only works if all the PCI devices (whether emulated or host-assigned)
are to be associated with the same guest NUMA node. This is a pretty
restrictive setup and so of limited use IMHO.
Yes. It is restrictive. There can be no 1:1 pinning of host to guest
nodes. But, one can have multiple host nodes pinned to 1 guest node
which the host bridge is pinned to.
This helps only to the extent that, the guest drivers wont find -1 in
the sysfs/numa_node. Some drivers are known to crash when they find
-1. The patch addresses that part of the problem.
It seems like to solve this requires that we create multiple PCI Host
Bridges ?
Yes. That will be the actual fix to have 1:1 pinning. The current
approach keeps that in mind and we can have the numa_node attribute
set at the indivudual spapr-pci-host-bridge level when we have it.
Then, the individual <pci-root id=X> can have different target node as
I have in this patch.
Thanks,
Shivaprasad
Daniel
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