Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-12 Thread Kinney, Michael D
st 12, 2016 1:31 AM > To: Zeng, Star <star.z...@intel.com>; edk2-devel@lists.01.org > Cc: Kinney, Michael D <michael.d.kin...@intel.com>; Gao, Liming > <liming@intel.com> > Subject: Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC > Frequenc

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-12 Thread Zeng, Star
On 2016/8/12 16:31, Paolo Bonzini wrote: On 11/08/2016 04:37, Star Zeng wrote: Minimize the code overhead between the two TSC reads by adding new internal API to calculate TSC Frequency instead of reusing MicroSecondDelay (). Cc: Michael D Kinney Cc: Liming Gao

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-12 Thread Paolo Bonzini
On 11/08/2016 04:37, Star Zeng wrote: > Minimize the code overhead between the two TSC reads by adding > new internal API to calculate TSC Frequency instead of reusing > MicroSecondDelay (). > > Cc: Michael D Kinney > Cc: Liming Gao > Cc: Paul

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-11 Thread Zeng, Star
On 2016/8/11 21:41, Brian J. Johnson wrote: On 08/10/2016 09:37 PM, Star Zeng wrote: Minimize the code overhead between the two TSC reads by adding new internal API to calculate TSC Frequency instead of reusing MicroSecondDelay (). Why not just use the MSR_PLATFORM_INFO (0xce) register bits

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-11 Thread Brian J. Johnson
On 08/10/2016 09:37 PM, Star Zeng wrote: Minimize the code overhead between the two TSC reads by adding new internal API to calculate TSC Frequency instead of reusing MicroSecondDelay (). Why not just use the MSR_PLATFORM_INFO (0xce) register bits 15..8, on CPUs where it's available, to read

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-10 Thread Kinney, Michael D
Reviewed-by: : Michael D Kinney > -Original Message- > From: Zeng, Star > Sent: Wednesday, August 10, 2016 7:38 PM > To: edk2-devel@lists.01.org > Cc: Zeng, Star ; Kinney, Michael D > ; > Gao, Liming

Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-10 Thread Gao, Liming
Reviewed-by: Liming Gao > -Original Message- > From: Zeng, Star > Sent: Thursday, August 11, 2016 10:38 AM > To: edk2-devel@lists.01.org > Cc: Zeng, Star ; Kinney, Michael D > ; Gao, Liming ;

[edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Get more accurate TSC Frequency

2016-08-10 Thread Star Zeng
Minimize the code overhead between the two TSC reads by adding new internal API to calculate TSC Frequency instead of reusing MicroSecondDelay (). Cc: Michael D Kinney Cc: Liming Gao Cc: Paul A Lohr Contributed-under: