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Date: Sat, 25 Oct 2003 17:33:00 -0400 (EDT)
From: Jeff Roberson <jroberson@chesapeake.net>
To: Peter Wemm <peter@FreeBSD.org>
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Subject: Re: cvs commit: src/sys/i386/i386 pmap.c
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On Sat, 25 Oct 2003, Peter Wemm wrote:

> peter       2003/10/25 11:51:41 PDT
>
>   FreeBSD src repository
>
>   Modified files:
>     sys/i386/i386        pmap.c
>   Log:
>   For the SMP case, flush the TLB at the beginning of the page zero/copy
>   routines.  Otherwise we run into trouble with speculative tlb preloads
>   on SMP systems.  This effectively defeats Jeff's revision 1.438
>   optimization (for his pentium4-M laptop) in the SMP case.  It breaks
>   other systems, particularly athlon-MP's.

If the page tables are NULL why does this break speculative tlb preloads?

>
>   Revision  Changes    Path
>   1.450     +13 -0     src/sys/i386/i386/pmap.c
>