linux-kernel - RE: Hi, Ingo, would you please help drop the TSC MSR calibration patch

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Date:	Tue, 12 Jul 2016 00:57:38 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>,
	Ingo Molnar <mingo@...nel.org>
CC:	'Len Brown' <lenb@...nel.org>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Hi, Ingo, would you please help drop the TSC MSR calibration
 patch

Hi, 
> -----Original Message-----
> From: Pan, Jacob jun
> Sent: Tuesday, July 12, 2016 5:19 AM
> To: Ingo Molnar
> Cc: Chen, Yu C; 'Len Brown'; Jacob Pan; H. Peter Anvin; Peter Zijlstra;
> x86@...nel.org; linux-kernel@...r.kernel.org; Pan, Jacob jun
> Subject: Re: Hi, Ingo, would you please help drop the TSC MSR calibration patch
> 
> On Mon, 11 Jul 2016 21:31:04 +0200
> Ingo Molnar <mingo@...nel.org> wrote:
> 
> >
> > * Jacob Pan <jacob.jun.pan@...el.com> wrote:
> >
> > > On Mon, 11 Jul 2016 07:59:19 -0700
> > > "Chen, Yu C" <yu.c.chen@...el.com> wrote:
> > >
> > > > Currently it is in your x86/timer tree:
> > > >
> > > > commit fc273eeef314cdaf0ac992b400d126f8184a4d1c
> > > > Author: Len Brown <len.brown@...el.com>
> > > > Date:   Fri Jun 17 01:22:49 2016 -0400
> > > >
> > > >     x86/tsc_msr: Extend to include Intel Core Architecture
> > > >
> > > >
> > > > Previously we found this patch might decrease the performance on
> > > > one of our servers, due to the small gap between using old PIT
> > > > calibration and new MSR calibration method, so we currently would
> > > > like to hold this patch for now, until we got a clear answer from
> > > > our architect. Would you please help revert this patch (the other
> > > > patches are safe and can be merged), sorry for the inconvenience.
> > > >
> > > I modified the subject slightly to be more specific.
> > > Adding lkml and x86 list, and a few more people.
> > > This commit is also affected, won't compile if we revert the one
> > > above.
> > >
> > > 37c528e... x86/tsc_msr: Fix rdmsr(MSR_PLATFORM_INFO) unsafe warning
> > > in KVM guest
> >
> > Ok, I've rebased tip:x86/timers, it now includes the following
> > commits:
> >
> > ff4c86635ee1 x86/tsc: Enumerate BXT tsc_khz via CPUID
> > aa297292d708 x86/tsc: Enumerate SKL cpu_khz and tsc_khz via CPUID
> > 02c0cd2dcf7f x86/tsc_msr: Remove irqoff around MSR-based TSC
> > enumeration 6fcb41cdaee5 x86/tsc_msr: Add Airmont reference clock
> > values 05680e7fa8a4 x86/tsc_msr: Correct Silvermont reference clock
> > values 9e0cae9f6227 x86/tsc_msr: Update comments, expand definitions
> > 14bb4e34860a x86/tsc_msr: Remove debugging messages
> > ba8268330dc1 x86/tsc_msr: Identify Intel-specific code
> > fc5f3ac24720 Revert "x86/tsc: Add missing Cherrytrail frequency to the
> > table"
> >
> > Does that work for you?
> >
> works for me but Yu has to confirm.
> 
Confirmed, thanks!

thanks,
Yu