Dear All: Got it. Thank you very much.
Thanks 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 fanjianf...@byosoft.com.cn 发送时间: 2021年2月23日 9:18 收件人: devel@edk2.groups.io; lersek <ler...@redhat.com>; Tiger Liu(BJ-RD) <tiger...@zhaoxin.com> 主题: Re: [edk2-devel] MP Services Protocol : Support Hyper threading or not " 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. Jeff From: Laszlo Ersek<mailto:ler...@redhat.com> Date: 2021-02-22 18:39 To: devel<mailto:devel@edk2.groups.io>; tigerliu<mailto:tiger...@zhaoxin.com> 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 保密声明： 本邮件含有保密或专有信息，仅供指定收件人使用。严禁对本邮件或其内容做任何未经授权的查阅、使用、复制或转发。 CONFIDENTIAL NOTE: This email contains confidential or legally privileged information and is for the sole use of its intended recipient. Any unauthorized review, use, copying or forwarding of this email or the content of this email is strictly prohibited. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#72025): https://edk2.groups.io/g/devel/message/72025 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] -=-=-=-=-=-=-=-=-=-=-=-
