On 02/23/21 02:17, fanjianf...@byosoft.com.cn wrote: > " Will EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() make all 8 logical cores do > some tasks simultaneously?" > > All APs logical processors excute AP task, not including BSP. Acutally the > answer is 7.
Good point :) Thanks Laszlo > > Jeff > > From: Laszlo Ersek > Date: 2021-02-22 18:39 > To: devel; tigerliu > Subject: Re: [edk2-devel] MP Services Protocol : Support Hyper threading or > not > On 02/22/21 08:08, Tiger Liu(BJ-RD) wrote: >> Dear All: >> I have a question about MP Services Protocol. >> Does it support Hyper-threading technology? >> >> For example: >> A Quad-cores CPU(with HT feature support), actually it is equal to 8 logical >> cores. >> Take assumption 8 logical cores are all healthy and being enabled. >> >> So: >> >> 1. Will EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors()return total 8 >> logical processor cores? >> >> 2. Will EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() make all 8 logical >> cores do some tasks simultaneously? > > My understanding is "yes", to both questions. Most of the MP stuff deals > with "logical processors". > > > BTW, if you check the EFI_MP_SERVICES_GET_PROCESSOR_INFO prototype, it > outputs EFI_PROCESSOR_INFORMATION. The latter has the following fields: > > EFI_CPU_PHYSICAL_LOCATION Location; > EXTENDED_PROCESSOR_INFORMATION ExtendedInformation; > > The former gives you a package/core/thread identification for a > particular processor number. The latter (optionally) provides a 6-level > description (package / module / tile / die / core / thread). In each > information structure, "logical thread" is the finest granularity > information. > > hth > Laszlo > > > > > > > > > > > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#72095): https://edk2.groups.io/g/devel/message/72095 Mute This Topic: https://groups.io/mt/80819705/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
