[Bug 2072760] Re: [24.10 FEAT] [KRN1911] Vertical CPU Polarization Support Stage 2

This bug is awaiting verification that the linux-
hwe-6.11/6.11.0-9.9~24.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-noble-linux-
hwe-6.11' to 'verification-done-noble-linux-hwe-6.11'. If the problem
still exists, change the tag 'verification-needed-noble-linux-hwe-6.11'
to 'verification-failed-noble-linux-hwe-6.11'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-hwe-6.11-v2 verification-needed-noble-linux-hwe-6.11

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https://bugs.launchpad.net/bugs/2072760

Title:
[24.10 FEAT] [KRN1911] Vertical CPU Polarization Support Stage 2

Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released

Bug description:
Description:

The linux kernel already provides a mechanism to switch from horizontal to vertical polarization. However the current implementation does not tell the Linux scheduler about the "cpu capacity" of the different types of vertical cpus.
For vertical high cpus cpu capacity is 100%. For vertial low cpus it should be close to 0% (should not be used). Difficult is to tell the cpu capacity of vertical medium cpus.

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