svn commit: r210124 - head/sys/amd64/amd64

[Peter Jeremy]

On 2010-Jul-15 16:25:51 +0000, Alan Cox <alc at FreeBSD.org> wrote:
>Log:
>  Optimize pmap_remove()'s handling of PG_G mappings.  Specifically,
...
>  calls pmap_invalidate_page().  Altogether, these changes eliminate 53%
>  of the TLB shootdowns for a "buildworld" on a ZFS file system.  On
>  FFS, the reduction is 3%.

I have no feeling for the cost of a TLB shootdown.  What is the likely
impact on buildworld on a ZFS filesystem?  Barely noticable or several
percent faster?

-- 
Peter Jeremy
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