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min_free_kbytes in hpc-compute overridden by khugepaged #752

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sjpb opened this issue Feb 20, 2025 · 0 comments
Open

min_free_kbytes in hpc-compute overridden by khugepaged #752

sjpb opened this issue Feb 20, 2025 · 0 comments

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@sjpb
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sjpb commented Feb 20, 2025

When applying the hpc-compute profile to a machine, tuned-adm verify reported errors and the log showed:

ERROR    tuned.plugins.base: verify: failed: 'vm.min_free_kgbytes' = '225280', expected '135168'

Looking in dmesg I found this:

[1301733.791460] khugepaged: raising min_free_kbytes from 135168 to 225280 to help transparent hugepage allocations

Looking at the comment at https://github.com/redhat-performance/tuned/blob/889387b0001b783514523162de21af406e31a549/profiles/hpc-compute/tuned.conf#L20C4-L20C19 I'd assume the larger value from khugepaged is actually better? And the setting really wants to be ">=135168", not that that's an option.
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