Re: [Xen-ia64-devel] [patch] increase xen-heap-size based on nodes-shift

[Jes Sorensen <jes@xxxxxxx>]

Isaku Yamahata wrote:
> On Wed, Jun 13, 2007 at 03:43:57PM +0200, Jes Sorensen wrote:

>> For the bigger systems we need a slightly bigger heap or the heap
>> will overflow. Unfortunately there is no easy way to determine the
>> size dynamically this early in the boot process before the nodes have
>> been discovered.
> 
> Should we introduce xenheap_megabytes boot parameter
> like x86, powerpc instead of changing default value?

We could do that, but I think we should do it on top of my patch. Ie.
I think it's better to have a too large heap per default and then let
the users reduce it rather than the other way round. What do you think?

> BTW I'm just curious about who uses up xenheap.
> Do you have any ideas on it?
> Before it was p2m table, but now it is allocated from domheap
> by default.

I believe it's mostly used to handle the large memory zones, page table
entries etc. and CPU structures.

Cheers,
Jes

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