Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer

["Benjamin Doron" <benjamin.doron00@gmail.com>]

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Hi Nate,
Ah, that makes sense. Thanks!

Best regards,
Benjamin

On January 9, 2024 8:28:08 p.m. EST, "Desimone, Nathaniel L" <nathaniel.l.desimone@intel.com> wrote:
>Hi Benjamin,
>
>We consider using the LAPIC as a timer to be technically superior because it is closer to the CPU. The HPET is a PCH device, which means all access to the timer needs go from CPU -> Home Agent -> Fabric/IO Ring -> DMI Controller -> PCH. Using the LAPIC cuts this path to just the Home Agent. That reduces access latency, which for a timer means higher resolution.
>
>Hope that helps,
>Nate
>
>From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Benjamin Doron <benjamin.doron00@gmail.com>
>Date: Tuesday, January 9, 2024 at 3:48 PM
>To: Ma <>, Ma, Hua <Hua.Ma@intel.com>, devel@edk2.groups.io <devel@edk2.groups.io>
>Subject: Re: [edk2-devel] [PATCH] UefiPayloadPkg: Add macro to enable selection of timer
>Hi,
>Are there platforms that will use this? What advantages does using the LAPIC as a timer offer? Thanks.
>
>Regards,
>Benjamin
>


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