405 TLB miss reduction

Joakim Tjernlund joakim.tjernlund at lumentis.se
Mon Dec 15 22:26:39 EST 2003

> > > I've also been thinking about dynamically using large
> TLB/PTE mappings
> > > for ioremap on 405/440.
> >
> > OK, I expect not so much benefit from this measure but it
> depends on the
> > application, of course.
> Yes, I've seen a lot of apps with huge shared memory areas across PCI
> that can benefit from this...they used BATs on classic PPCs.

hmm, I wonder if this would be useful for systems using JFFS2/MTD?
JFFS2/MTD usually ioremaps the underlying FLASH memory, which can be
many MB.


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