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.doro...@gmail.com> Date: Tuesday, January 9, 2024 at 3:48 PM To: Ma <>, Ma, Hua <hua...@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 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#113504): https://edk2.groups.io/g/devel/message/113504 Mute This Topic: https://groups.io/mt/103538255/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
