There's a great performance down if we enable heap guard features. This feature will frequently update page attribute to set/unset guard pages, which is done by CpuArchProtocol.SetMemoryAttributes. In the implementation of this method (in CpuDxe), it will call MpProtocol.StartupAllAps() to flush TLB for all APs after updating page attributes. We found that StartupAllAps() will spend a lot of time to complete the flush operation. For example, listing a folder content in shell will take 55s to complete. Normally it should take less than 5s.
The solution is removing the flush operation for AP in CpuDxe driver but let AP do it in its own wakeup code. There's no need to flush TLB for AP who has no chance to run code. Jian J Wang (2): UefiCpuPkg/MpInitLib: force flushing TLB for AP in mwait loop mode UefiCpuPkg/CpuDxe: remove all code to flush TLB for APs UefiCpuPkg/CpuDxe/CpuPageTable.c | 85 +++--------------------------------- UefiCpuPkg/Library/MpInitLib/MpLib.c | 6 +++ 2 files changed, 11 insertions(+), 80 deletions(-) -- 2.15.1.windows.2 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
