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From: Cort Dougan <cort@fsmlabs.com>
Date: Wed, 10 Jul 2002 22:46:40 -0600
To: "David S. Miller" <davem@redhat.com>
Cc: rusty@rustcorp.com.au, adam@yggdrasil.com, R.E.Wolff@BitWizard.nl,
       linux-kernel@vger.kernel.org
Subject: Re: Rusty's module talk at the Kernel Summit
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References: <200207041724.KAA06758@adam.yggdrasil.com> <20020711124830.26e2388b.rusty@rustcorp.com.au> <20020710.194555.88475708.davem@redhat.com> <20020710220244.K18791@host110.fsmlabs.com>
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I checked out the sparc64 PTE structure.  It's not a bozo-design which I
thought it was (like some PPC's).  If you can select powers of 2 sizes my
concern is meaningless there since you can pick the appropriate
granularity.

A genuine Bershad-esque superpages design would be perfect there.

} Large PTE's aren't free either, though.  Cheap enough to implement but
} there's some fragmentation that isn't easy to deal with in some
} pathological cases.  The virtual space is pretty tight on some archs
} already.
} 
} A lot of stock distributions load most drivers as modules so a machine well
} stocked with devices may run into trouble.
} 
} } Modules can be mapped using a large PTE mapping.
} } I've been meaning to do this on sparc64 for a long
} } time.
} } 
} } So this TLB argument alone is not sufficient :-)
} } I do concur on the "ipv4 as module is difficult to
} } get correct" argument however.
} } -
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