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x86 NUMA error on OSSTest box
- To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Mon, 3 Oct 2022 21:21:37 +0000
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- Thread-topic: x86 NUMA error on OSSTest box
While working on another issue, I spotted this:
(XEN) ACPI: EINJ 6CB9D638, 0150 (r1 ORACLE X7-2 41060300 INTL 1)
(XEN) System RAM: 32429MB (33208204kB)
(XEN) SRAT: Node 0 PXM 0 [0000000000000000, 000000007fffffff]
(XEN) SRAT: Node 0 PXM 0 [0000000100000000, 000000047fffffff]
(XEN) SRAT: Node 1 PXM 1 [0000000480000000, 000000087fffffff]
(XEN) NUMA: Using 19 for the hash shift.
(XEN) Your memory is not aligned you need to rebuild your hypervisor
with a bigger NODEMAPSIZE shift=19
(XEN) SRAT: No NUMA node hash function found. Contact maintainer
(XEN) SRAT: SRAT not used.
(XEN) No NUMA configuration found
(XEN) Faking a node at 0000000000000000-0000000880000000
(XEN) Domain heap initialised
on sabro0 in OSSTest on current staging. I do not know if it's a recent
regression or not.
The SRAT looks reasonable (in fact, far better than most I've seen).
Given no legitimate requirement for aligned memory that I'm aware of, I
think Xen's behaviour here is buggy and wants resolving.
~Andrew
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