We don't consider the RMA boundary for the Xen heap at all anymore (not for a while)
The Xen heap is calculated based on the estimated resources we'll need.
on example is that we need to get enough HTABs for all the domain, so 1/64th of all of memory is part of the Xen heap size.


check out powerpc/memory.c: memory_init()

On Feb 22, 2007, at 5:28 PM, Hollis Blanchard wrote:

On Thu, 2007-02-22 at 16:07 -0600, Ryan Harper wrote:

IIRC, when dom0 boots with 192MB (the default) I usually see ~19MB of
heap available in the boot messages on js20.  Looking at js21, I see:

(XEN) Xen Heap: 135MiB (138548KiB)

RMA different size on js21?

That's an unusual size: it's slightly more than the second 64MB RMA
boundary, which seems to indicate there's a lot of wasted memory before dom0 at 192MB. I wonder if this is related to the 4GB of memory in this
system. A more complete boot log might shed some light on it.

To answer your question, the 970MP (in JS21) supports the same RMA sizes
as 970 and 970FX (in JS20).

--
Hollis Blanchard
IBM Linux Technology Center


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