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

["Dong, Eric" <eric.dong@intel.com>]

Hi Laszlo,

> -----Original Message-----
> From: Laszlo Ersek [mailto:lersek@redhat.com]
> Sent: Thursday, July 12, 2018 5:58 PM
> To: Dong, Eric <eric.dong@intel.com>; edk2-devel@lists.01.org
> Subject: Re: [edk2] [Patch 0/3] Optimize load uCode performance
> 
> 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(-)
> >
> >
> >
> > _______________________________________________
> > edk2-devel mailing list
> > edk2-devel@lists.01.org
> > https://lists.01.org/mailman/listinfo/edk2-devel
> >
> 
> I also tried to regression test this with OVMF. (I know I requested some
> changes for patch #1, however those would only affect behavior in practice
> when memory allocation fails, so it makes sense for me to test this version of
> the series as well.)
> 
> Unfortunately, the patch set doesn't apply; it fails with the first patch already.
> I tried on top of current master, commit 0a563f3fecfd
> ("BaseTool: Fixed the incorrect cache key.", 2018-07-12).
> 
> Can you please post a v2 that is also rebased on current master?
> 

I just send v2 patches base on the latest codebase, please verify with the newer one.

> Thanks
> Laszlo