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Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes
From: |
Michael Ellerman |
Subject: |
Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes |
Date: |
Wed, 31 Mar 2021 15:58:03 +1100 |
David Gibson <david@gibson.dropbear.id.au> writes:
> On Mon, Mar 29, 2021 at 03:32:37PM -0300, Daniel Henrique Barboza wrote:
...
>
>> We assign ibm,chip-id=0x0 to CPUs 0-3, but CPUs 2-3 are located in a
>> different NUMA node than 0-1. This would mean that the same socket
>> would belong to different NUMA nodes at the same time.
>
> Right... and I'm still not seeing why that's a problem. AFAICT that's
> a possible, if unexpected, situation under real hardware - though
> maybe not for POWER9 specifically.
I think I agree.
>> I believe this is what Cedric wants to be addressed. Given that the
>> property is called after the OPAL property ibm,chip-id, the kernel
>> expects that the property will have the same semantics as in OPAL.
>
> Even on powernv, I'm not clear why chip-id is tied into the NUMA
> configuration, rather than getting all the NUMA info from
> associativity properties.
AFAIK we don't use chip-id for anything related to NUMA, if we do I'd
consider that a bug.
We do use it for topology_physical_package_id(), but that's almost
completely unused.
cheers
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, (continued)
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/22
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Daniel Henrique Barboza, 2021/03/23
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/24
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Cédric Le Goater, 2021/03/25
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Daniel Henrique Barboza, 2021/03/25
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/29
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Cédric Le Goater, 2021/03/29
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Daniel Henrique Barboza, 2021/03/29
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Igor Mammedov, 2021/03/29
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/30
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes,
Michael Ellerman <=
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Cédric Le Goater, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Cédric Le Goater, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Daniel Henrique Barboza, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Cédric Le Goater, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, David Gibson, 2021/03/31
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Igor Mammedov, 2021/03/29
- Re: [PATCH 1/2] spapr: number of SMP sockets must be equal to NUMA nodes, Daniel Henrique Barboza, 2021/03/30
[PATCH 2/2] spapr.c: remove 'ibm,chip-id' from DT, Daniel Henrique Barboza, 2021/03/19