Date: Wed, 25 Jun 2003 22:48:00 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Mike Silbersack <silby@silby.com> Cc: current@freebsd.org Subject: Re: Best way to get max KVA setting? Message-ID: <3EFA8910.6E271781@mindspring.com> References: <20030625002841.X7607@odysseus.silby.com> <3EF95C9D.2CE63283@mindspring.com> <20030625123457.J7607@odysseus.silby.com>
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Mike Silbersack wrote:
> I found the thread in question, but I didn't see a patch.
ARGH. There was a simultaneous off-list discussion; here is
the scrubbed part of what I sent; it's a patch, but it's not a
diff; sorry for the confusion.
-- Terry
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The correct place to hack the is /usr/src/sys/kern/subr_param.c.
Specifically, every place it references "physpages", the number
is way, way too big.
At the very top of the routine init_param2(), put something like:
long ephyspages; /* effective physical pages */
long clamp = 3 * 1024 * 256; /* 3G, in pages */
ephyspages = physpages;
/* clamp effective memory to real KVA limits */
if (ephyspages > clamp)
ephyspages = clamp;
And then everywhere it references "physpages" below that, change
it to "ephyspages" instead.
In the version of the file I have, it looks like you could
override everything at boot time; I didn't check to see how
much (or if) this had changed in -current, so it may be that
you could tweak everything you needed to then, instead.
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