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Re: [PATCH v14 01/11] s390x/cpu topology: adding s390 specificities to C


From: Thomas Huth
Subject: Re: [PATCH v14 01/11] s390x/cpu topology: adding s390 specificities to CPU topology
Date: Tue, 17 Jan 2023 08:22:37 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0

On 16/01/2023 18.28, Pierre Morel wrote:


On 1/13/23 17:58, Nina Schoetterl-Glausch wrote:
On Thu, 2023-01-05 at 15:53 +0100, Pierre Morel wrote:
S390 adds two new SMP levels, drawers and books to the CPU
topology.
The S390 CPU have specific toplogy features like dedication
and polarity to give to the guest indications on the host
vCPUs scheduling and help the guest take the best decisions
on the scheduling of threads on the vCPUs.

Let us provide the SMP properties with books and drawers levels
and S390 CPU with dedication and polarity,

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
...
PTF([01]) are no performance bottle neck and the number of CPU is likely to be small, even a maximum of 248 is possible KVM warns above 16 CPU so the loop for setting all CPU inside PTF interception is not very problematic I think.

KVM warns if you try to use more than the number of physical CPUs that you have, not at hard-coded 16 CPUs. So if you've got an LPAR with 248 CPUs, it's perfectly fine to use also 248 CPUs for your guest.

 Thomas




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