Re: 回复: [edk2-devel] [PATCH v2] MdePkg: use CpuPause() in CpuDeadLoop()

["Laszlo Ersek" <lersek@redhat.com>]

Hi Liming,

On 03/19/21 02:04, gaoliming wrote:
> Ankur:
>   Seemly, the patch is missing in this mail. 

I can see the patch body just fine in my mailbox / list folder.

Also, the list archives seem to have it:

- https://edk2.groups.io/g/devel/message/73018
- http://mid.mail-archive.com/20210318184504.2745112-1-ankur.a.arora@oracle.com
- https://listman.redhat.com/archives/edk2-devel-archive/2021-March/msg00765.html

Ankur, can you post a "RESEND v2" please, anyway?

Thanks
Laszlo

> 
> Thanks
> Liming
>> -----邮件原件-----
>> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Ankur Arora
>> 发送时间: 2021年3月19日 2:45
>> 收件人: devel@edk2.groups.io
>> 抄送: Ankur Arora <ankur.a.arora@oracle.com>; Liming Gao
>> <gaoliming@byosoft.com.cn>; Michael D Kinney
>> <michael.d.kinney@intel.com>; Laszlo Ersek <lersek@redhat.com>
>> 主题: [edk2-devel] [PATCH v2] MdePkg: use CpuPause() in CpuDeadLoop()
>>
>> CpuPause() might allow the CPU to go into a lower power state
>> state while we spin.
>>
>> On X86, CpuPause() executes a PAUSE instruction which the Intel
>> and AMD specs describe as follows:
>>
>> Intel:
>>   "PAUSE: An additional function of the PAUSE instruction is to reduce
>>   the power consumed by a processor while executing a spin loop. A
>>   processor can execute a spin-wait loop extremely quickly, causing the
>>   processor to consume a lot of power while it waits for the resource it
>>   is spinning on to become available. Inserting a pause instruction in a
>>   spin-wait loop greatly reduces the processorb
> 
>