On 05/30/2015 10:44 PM, Len Brown wrote:
From: Len Brown <len.br...@intel.com>
Speed cpu_up() by believing CPUID's "invariant TSC" flag,
and skipping the TSC warp test on single socket systems.
I'm typing this email on a "Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz"
with a "X79A-GD65 (8D) (MS-7760)" motherboard. (DO NOT BUY THAT
MOTHERBOARD!)
The brilliant stock firmware breaks TSC sync on bootup. Even with the
updated firmware I'm using, it's broken on resume from S3.
If you want to make this depend on X86_FEATURE_TSC_ADJUST and confirm
that all cores have the same IA32_TSC_ADJUST value, then maybe that
would be okay. Otherwise, please don't underestimate the malice^Wgross
incompetence of firmware vendors.
--Andy
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