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Date: Fri, 2 Nov 2012 14:28:56 -0700
Message-ID: <CAGH67wSDdmsJxP5UVGK_VZLGUSXU9ENJ84i04SKMku1frG-nKw@mail.gmail.com>
Subject: Re: svn commit: r242466 - head/sys/mips/mips
From: Garrett Cooper <yanegomi@gmail.com>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: svn-src-head@freebsd.org, Ian Lepore <freebsd@damnhippie.dyndns.org>,
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On Fri, Nov 2, 2012 at 2:26 PM, Adrian Chadd <adrian@freebsd.org> wrote:

> On 2 November 2012 08:09, Ian Lepore <freebsd@damnhippie.dyndns.org>
> wrote:
>
> > Of course, it doesn't save anything if the system is using more than 128
> > maps, did you check?  When I checked on an arm dreamplug system, there
> > were roughly 1850 maps allocated by time it got to the login prompt
> > (making that local cache of 500 maps completely useless).
>
> I don't reach that during boot on my 16MB RAM APs. There just aren't
> that many devices.
>
> > The patches I posted in arch@ a while back addressed this problem by
> > setting up an uma(9) pool for maps (and pools for busdma buffers).  The
> > patches were designed to be easy to incorporate for both arm and mips
> > busdma implementations.
>
> My problem is memory overhead at boot time. :/
>

Maybe this should be a compile time constant that one can specify in their
KERNCONF?
Cheers,
-Garrett