Bug 42760 - Raise number of supported CPUs
Summary: Raise number of supported CPUs
Status: NEW
Alias: None
Product: Sisyphus
Classification: Development
Component: qemu (show other bugs)
Version: unstable
Hardware: x86 Linux
: P5 normal
Assignee: Alexey Shabalin
QA Contact: qa-sisyphus
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-05-13 22:58 MSK by Vitaly Chikunov
Modified: 2022-05-13 23:21 MSK (History)
4 users (show)

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Description Vitaly Chikunov 2022-05-13 22:58:22 MSK 
+ qemu-system-x86_64 -smp cores=1111 ...
qemu-system-x86_64: Invalid SMP CPUs 1111. The max CPUs supported by machine 'pc-i440fx-6.2' is 255

+ qemu-system-x86_64 -M q35 -smp cores=1111 ...
qemu-system-x86_64: Invalid SMP CPUs 1111. The max CPUs supported by machine 'pc-q35-6.2' is 288
Comment 1 Vitaly Chikunov 2022-05-13 23:07:06 MSK 
Возможно, больше 1024 поднимать не имеет смысла так как, на x86-64 есть ещё не изменяемый лимит

  #define KVM_MAX_VCPUS 1024
Comment 2 Vitaly Chikunov 2022-05-13 23:21:01 MSK 
https://access.redhat.com/articles/rhel-kvm-limits
Intel 64 and AMD64: Red Hat Enterprise Linux 8 Server with KVM
Maximum number of virtual CPUs in virtualized guest 384

https://access.redhat.com/articles/906543
Virtual Machine Maximums:
710 for RHV 4.4 (710 for Q35 machines, 240 for PC machines)

Host Maximums:
Logical CPU cores or threads: 768