https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199151
Bug ID: 199151
Summary: speed up pagezero assembly on Xeon
Product: Base System
Version: 11.0-CURRENT
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: l...@pix.net
Created attachment 155167
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155167&action=edit
diff to sys/amd64/amd64/support.S - pagezero function
The attached patch gives a consistant 1% decrease in system time when
doing something that forks a bunch of jobs, like buildworld or buildkernel,
when running with modestly high -j values (-j 24 or -j 32).
We have been running this in production for a couple of months.
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