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Re: x86 NUMA error on OSSTest box
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Oct 2022 11:25:32 +0200
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- Cc: Henry Wang <Henry.Wang@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Tue, 04 Oct 2022 09:25:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.10.2022 23:21, Andrew Cooper wrote:
> 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.
That's yet another off-by-1 afaics, which was not mattering until the
first off-by-1 was eliminated. I'll make a(nother) patch, but I first
want to figure out why I didn't see this issue myself (of whether I
merely overlooked it).
Jan
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