Re: "[edk] Caculating time delay in milliseconds"

[Michael Zimmermann <sigmaepsilon92@gmail.com>]

Another way that can be very unreliable though is creating a timer
event using CreateEvent and incrementing a counter inside the
callback.
This will not give you exact values and the results can vary greatly
depending on the platform implementation and the cpu load but in
theory it should be better than GetTime - at least for calculating
time differences(not for absolute time).

Thanks
Michael

On Mon, Mar 6, 2017 at 5:30 AM, Arka Sharma <arka.sw1988@gmail.com> wrote:
> Thanks Mike for the reply but EFI_TIMESTAMP_PROTOCOL is not there in
> my platform. I tried to open it using gBS->LocateProtocol() and it
> returned EFI_NOT_FOUND
>
> On Thu, Mar 2, 2017 at 11:38 PM, Kinney, Michael D
> <michael.d.kinney@intel.com> wrote:
>> For UEFI Drivers/Applications there is also the EFI_TIMESTAMP_PROTOCOL
>> if it is available on your platform.
>>
>> Mike
>>
>>> -----Original Message-----
>>> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Michael
>>> Zimmermann
>>> Sent: Thursday, March 2, 2017 4:06 AM
>>> To: Arka Sharma <arka.sw1988@gmail.com>
>>> Cc: edk2-devel@lists.01.org
>>> Subject: Re: [edk2] "[edk] Caculating time delay in milliseconds"
>>>
>>> AFAIK the only way to do that is to use the platform specific TimerLib
>>> like this:
>>>
>>> UINT64
>>> GetTimeMs (
>>>   VOID
>>> )
>>> {
>>>   return GetTimeInNanoSecond(GetPerformanceCounter()) / 1000000ULL;
>>> }
>>>
>>> Thanks
>>> Michael
>>>
>>> On Thu, Mar 2, 2017 at 12:53 PM, Arka Sharma <arka.sw1988@gmail.com> wrote:
>>> > gRT->GetTime() is accurate about seconds.Is there any way to calculate
>>> > time difference in milliseconds ?
>>> > Let's say
>>> >
>>> > Time1 = GetTimeMs();
>>> >
>>> > //
>>> > // Some tasks
>>> > //
>>> >
>>> > Time2 = GetTimeMs();
>>> >
>>> > //
>>> > // Time taken
>>> > //
>>> > GetTimeDiff (Time1, Time2);
>>> >
>>> > Something like this
>>> >
>>> > Regards,
>>> > Arka
>>> > _______________________________________________
>>> > edk2-devel mailing list
>>> > edk2-devel@lists.01.org
>>> > https://lists.01.org/mailman/listinfo/edk2-devel
>>> _______________________________________________
>>> edk2-devel mailing list
>>> edk2-devel@lists.01.org
>>> https://lists.01.org/mailman/listinfo/edk2-devel