Re: [Patch 0/3] Optimize load uCode performance

[Laszlo Ersek <lersek@redhat.com>]

Hi Eric,

On 07/11/18 13:07, Eric Dong wrote:
> Use below three rules to optimize load uCode performance:
> 1. Let BSP relocate uCode from flash to memory for better performance.
> 2. BSP caches the CPU ID and address of uCode so AP doesn’t need to look 
>    for the uCode again if the CPU ID is same as BSP’s.
> 3. Only apply uCode in one thread of a core when hyper threading is enabled.
> 
> Test:
> Use an sample platform which has 1 socket, 4 core, 8 threads, the CpuMpPei
> driver cost time reduce from 108.4ms to 27.2ms
> 
> Eric Dong (3):
>   UefiCpuPkg/MpInitLib: Relocate uCode to memory to save time.
>   UefiCpuPkg/MpInitLib: Use BSP uCode for APs if possible.
>   UefiCpuPkg/MpInitLib: Load uCode once for one core.
> 
>  UefiCpuPkg/Library/MpInitLib/Microcode.c | 43 +++++++++++++++++++++++++++++---
>  UefiCpuPkg/Library/MpInitLib/MpLib.c     | 17 ++++++++++---
>  UefiCpuPkg/Library/MpInitLib/MpLib.h     | 11 ++++++--
>  3 files changed, 63 insertions(+), 8 deletions(-)

I'm putting off the regression-testing of this series until we come to a
conclusion on pushing Ray's patch first (see my message at
<http://mid.mail-archive.com/26d8afe6-f89b-ddfc-0e8b-6acdc311f121@redhat.com>).

Thanks!
Laszlo