Re: [PATCH 10/28] i386: map enough initial memory to create lowmemmappings

[H. Peter Anvin]

Andi Kleen wrote:
> On Thursday 19 April 2007 22:55:50 H. Peter Anvin wrote:
> > Andi Kleen wrote:
> > > > Is some version of this going in for 2.6.21, or is it not a real problem?
> > > When it's only seen with Xen it's not a real problem right now.
> > It's not just seen only with Xen, though.  It will affect all kernels in 
> > a particular range of sizes, and we have ordinary kernels covering that 
> > range (in fact, Xen hardly affects size in that way.)
>
> Then we would have seen reports surely?

The critical size window is relatively small, though.  The size of the 
uncompressed kernel mod 4 MB must be above 3.75 MB or so.  If you have 
less than 1 GB RAM, the window is even smaller.  This is strictly 
configuration-dependent, and has nothing to do with Xen.  It just so 
happened that the first people to detect and diagnose it (as opposed to 
just "it doesn't boot") were Xen people.

	-hpa
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