ARM_NEW_PMAP

[Ulrich Grey]

Hello,

I have compiled

make -j30 buildworld and print/texlive-full
without problems on a wandboard-quad (FreeBSD 11.0-CURRENT #0 r280772M).

Regards

Ulrich
----------------------------------
On Thu, 26 Mar 2015 17:45:02 -0600
Ian Lepore <ian at freebsd.org> wrote:

> With commit r280712, we now have a new alternate implementation of the
> arm pmap code available (the low-level part of virtual memory handling).
> Right now it's disabled by default; if you'd like to help test it, add
> to your kernel config:
> 
>   options ARM_NEW_PMAP
> 
> This new implementation is a complete rewrite, but is modeled after the
> mature and well-tested i386 pmap code.  In the testing I've done over
> the past few days I've noticed some performance improvement (a 12-minute
> kernel build on a wandboard quad is now 10 minutes).  Even more than
> performance, though, this new code should bring us better stability.
> 
> My testing showed that this does fix the "no l2 bucket..." panic that
> showed up recently.
> 
> If you need to check whether the new or old code is running on a system,
> use "sysctl vm.pmap.pte1.promotions", if that gives an "unknown oid"
> error you're running the old code.
> 
> Big Thanks go to Svata Kraus and Michal Meloun who contributed this code
> (along with an embarrassed apology that it took 2 years to get it
> committed).
> 
> -- Ian
> 
> 
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