On Tue, 11 Oct 2016, Bin Gao wrote:
> On Fri, Aug 26, 2016 at 12:14:58PM +0200, Thomas Gleixner wrote:
>
> The Linux kernel does think a reliable calibration implies the reliability
> (i.e.
> no watchdog required). I'm posting some code pieces to explain.
I know that and I know exactly how all t
On Fri, Aug 26, 2016 at 12:14:58PM +0200, Thomas Gleixner wrote:
> On Fri, 26 Aug 2016, Thomas Gleixner wrote:
> > On Thu, 25 Aug 2016, Bin Gao wrote:
> > > On Wed, Aug 24, 2016 at 10:51:20AM +0200, Thomas Gleixner wrote:
> > > > On Tue, 16 Aug 2016, Bin Gao wrote:
> > > > > On some newer Intel x86
On Fri, 26 Aug 2016, Thomas Gleixner wrote:
> On Thu, 25 Aug 2016, Bin Gao wrote:
> > On Wed, Aug 24, 2016 at 10:51:20AM +0200, Thomas Gleixner wrote:
> > > On Tue, 16 Aug 2016, Bin Gao wrote:
> > > > On some newer Intel x86 processors/SoCs the TSC frequency can be
> > > > directly
> > > > calcula
On Thu, 25 Aug 2016, Bin Gao wrote:
> On Wed, Aug 24, 2016 at 10:51:20AM +0200, Thomas Gleixner wrote:
> > On Tue, 16 Aug 2016, Bin Gao wrote:
> > > On some newer Intel x86 processors/SoCs the TSC frequency can be directly
> > > calculated by factors read from specific MSR registers or from a cpuid
On Wed, Aug 24, 2016 at 10:51:20AM +0200, Thomas Gleixner wrote:
> On Tue, 16 Aug 2016, Bin Gao wrote:
> > On some newer Intel x86 processors/SoCs the TSC frequency can be directly
> > calculated by factors read from specific MSR registers or from a cpuid
> > leaf (0x15). TSC frequency calculated b
On Tue, 16 Aug 2016, Bin Gao wrote:
> On some newer Intel x86 processors/SoCs the TSC frequency can be directly
> calculated by factors read from specific MSR registers or from a cpuid
> leaf (0x15). TSC frequency calculated by native msr/cpuid is absolutely
> accurate so we should always skip cali
On some newer Intel x86 processors/SoCs the TSC frequency can be directly
calculated by factors read from specific MSR registers or from a cpuid
leaf (0x15). TSC frequency calculated by native msr/cpuid is absolutely
accurate so we should always skip calibrating TSC aginst another clock,
e.g. PIT,
On Mon, Jun 20, 2016 at 04:20:26PM -0700, John Stultz wrote:
> On Fri, Jun 17, 2016 at 12:48 AM, Thomas Gleixner wrote:
> > On Thu, 16 Jun 2016, Bin Gao wrote:
> >
> >> Unlike PIT based calibration which counts TSC cycles against another timer,
> >> MSR or CPUID method has no calibration - it simp
On Fri, Jun 17, 2016 at 12:48 AM, Thomas Gleixner wrote:
> On Thu, 16 Jun 2016, Bin Gao wrote:
>
>> Unlike PIT based calibration which counts TSC cycles against another timer,
>> MSR or CPUID method has no calibration - it simply multiplies the known
>> frequency of a timer by a ratio. So TSC freq
On Thu, 16 Jun 2016, Bin Gao wrote:
> Unlike PIT based calibration which counts TSC cycles against another timer,
> MSR or CPUID method has no calibration - it simply multiplies the known
> frequency of a timer by a ratio. So TSC frequency computed by MSR or CPUID
> is the final frequency and does
Unlike PIT based calibration which counts TSC cycles against another timer,
MSR or CPUID method has no calibration - it simply multiplies the known
frequency of a timer by a ratio. So TSC frequency computed by MSR or CPUID
is the final frequency and doesn't need the refined calibration process.
We
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