Detect CPU type before asking VMWare for TSC freq
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Authored by cperciva on Jan 14 2022, 6:32 AM.

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Subscribers

imp

Details

Reviewers

markj

Summary

This allows us to set tsc_is_invariant and select appropriately
fenced versions of RDTSC based on the CPU type.

Sponsored by: https://www.patreon.com/cperciva

Diff Detail

Repository

rS FreeBSD src repository - subversion

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 43920
Build 40808: arc lint + arc unit

Event Timeline

cperciva created this revision.Jan 14 2022, 6:32 AM

Herald added a subscriber: imp. · View Herald TranscriptJan 14 2022, 6:32 AM

cperciva requested review of this revision.Jan 14 2022, 6:32 AM

Harbormaster completed remote builds in B43920: Diff 101448.Jan 14 2022, 6:32 AM

cperciva added a child revision: D33894: TSC: Use 0x40000010 CPUID leaf for all VM types.Jan 14 2022, 6:32 AM

markj accepted this revision.Jan 14 2022, 2:44 PM

This revision is now accepted and ready to land.Jan 14 2022, 2:44 PM

Committed. (I forgot to include the Differential Revision tag in the commit message.)

Revision Contents
Changeset List

Path

Size

sys/

x86/

tsc.c

11 lines

Diff 101448

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Detect CPU type before asking VMWare for TSC freqClosedPublicActions