CVS commit: src/sys/arch

["Andrew Doran" <ad%netbsd.org@localhost>]

Module Name:    src
Committed By:   ad
Date:           Fri Nov 22 23:36:25 UTC 2019

Modified Files:
        src/sys/arch/amd64/amd64: locore.S
        src/sys/arch/x86/x86: cpu.c

Log Message:
- On-demand zeroing pages with MOVNTI is crazy.  It empties L1/L2/L3.
- Disable zeroing in the idle loop.  That needs a cache-friendly strategy.

Result: 3 to 4% reduction in kernel build time on my test system.
Inspired by a discussion with Mateusz Guzik and David Maxwell.


To generate a diff of this commit:
cvs rdiff -u -r1.191 -r1.192 src/sys/arch/amd64/amd64/locore.S
cvs rdiff -u -r1.174 -r1.175 src/sys/arch/x86/x86/cpu.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.