Re: mpt sets 64bit consistent mask yet requires mapping in same 4 GB chunk?!?

From: Jeremy Higdon <jeremy_at_sgi.com>
Date: 2004-02-14 10:39:00
On Fri, Feb 13, 2004 at 11:13:08PM +0000, Matthew Wilcox wrote:
> On Fri, Feb 13, 2004 at 03:52:43PM -0700, Bjorn Helgaas wrote:
> > > I think Alex's second suggestion would be the best--do a single
> > > allocation rather than falling back to a 32 bit consistent mask.
> > 
> > But even with a single allocation, there's nothing to prevent it
> > from crossing a 4GB boundary, is there?
> 
> Since we use buddy allocators everywhere, we'd need to be doing 8GB
> allocations to cross a 4GB barrier.  Of course if we change allocators ...

... and this particular behavior, then I think lots of hardware will
stop working, because LSI is not the only vendor with this sort of
limitation  :-)

jeremy
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Received on Fri Feb 13 18:39:36 2004

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