Messages in this thread | | | Date | Mon, 23 Apr 2018 21:37:23 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] x86: tsc: fix L2 guest always in tsc_early clocksource |
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On Tue, Apr 24, 2018 at 09:08:54AM +0800, Peng Hao wrote: > In L2 guest tsc_read_refs always return ULLONG_MAX, and that will > call tsc_refine_calibration_work periodly. So L2 guest will read > acpi timer port 0x608 periodly. > The patch will let it out of "if(tsc_start == -1){}" infinite loop.
Help me out a little. What's an L2 guest?
And I'm assuming you don't have HPET and then end up wanting to use PM-timer? Which is also busted and resturns crap results?
So if the whole TSC sync has no way of ever working; what is your patch doing? How is the actual TSC calibrated?
Should you instead be using fast_calibrate() and passing in a known value from the host? Thereby avoiding all this calibration nonsense entirely.
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