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Date: Fri, 16 Jul 2010 17:16:54 +1000
From: Peter Jeremy <peterjeremy@acm.org>
To: Alan Cox <alc@FreeBSD.org>
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Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org,
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Subject: Re: svn commit: r210124 - head/sys/amd64/amd64
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On 2010-Jul-15 16:25:51 +0000, Alan Cox <alc@FreeBSD.org> wrote:
>Log:
>  Optimize pmap_remove()'s handling of PG_G mappings.  Specifically,
=2E..
>  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?

--=20
Peter Jeremy

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