cvs commit: src/sys/i386/i386 support.s src/sys/i386/include md_var.h

[Jeff Roberson]

This moves data 3.8x faster than bzero on my laptop.  In a moment I will
commit pmap bits to make use of it.  This improved my 'make kernel' times
by almost 2%.  It will do even better in workloads that demand a lot of
zero pages.

On Tue, 30 Sep 2003, Jeff Roberson wrote:

> jeff        2003/09/30 22:25:27 PDT
>
>   FreeBSD src repository
>
>   Modified files:
>     sys/i386/i386        support.s
>     sys/i386/include     md_var.h
>   Log:
>    - Add ss2_pagezero() for zeroing pages using the movnti instruction.  This
>      instruction is enabled with SSE2 but does not use SSE registers.  It is a
>      "non-temporal" move which bypasses the cache and does not dirty lines.
>
>   Revision  Changes    Path
>   1.98      +14 -0     src/sys/i386/i386/support.s
>   1.65      +1 -0      src/sys/i386/include/md_var.h
>