linux-kernel - RE: Skylake (XPS 13 9350) TSC is way off

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Message-ID: <1A7043D5F58CCB44A599DFD55ED4C948469538F6@fmsmsx115.amr.corp.intel.com>
Date:	Wed, 2 Dec 2015 22:52:48 +0000
From:	"Brown, Len" <len.brown@...el.com>
To:	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	"Hunter, Adrian" <adrian.hunter@...el.com>
Subject: RE: Skylake (XPS 13 9350) TSC is way off

+adrian

> [    0.000000] tsc: PIT calibration matches HPET. 2 loops
> [    0.000000] tsc: Detected 2399.975 MHz processor
> [    0.090897] TSC deadline timer enabled
> [    1.960034] tsc: Refined TSC clocksource calibration: 2400.007 MHz
> [    1.960039] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
> 0x22983e30402, max_idle_ns: 440795260848 ns
> [    2.959936] clocksource: Switched to clocksource tsc
> [   87.168211] Adjusting tsc more than 11% (5941981 vs 7759439)
> 
> This is more or less Linus' latest tree (v4.4-rc3 plus some unrelated
> platform driver patches).

Hi Andy,
Thanks for the note.
I'll send you a debug version of turbostat, off list,
since the list will just block mail with that attachment.

thanks,
-Len