Re: [Xen-devel] kernel Bug after upgrading to 3.0.2-2

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 28.04.06 18:22 >>>
>
>On 28 Apr 2006, at 17:06, Brian Hays wrote:
>
>> Already have it set. Here's my grub.conf settings ...
>>
>> title Xen 3.0 / 2.6.16
>>         kernel /xen.gz dom0_mem=200000
>>         module /vmlinuz-2.6.16-xen0 root=/dev/sda2 ro
>
>A little-known fact about PAE Xen is that you really want to use the 
>lowmem_emergency_pool boot parameter.
>
>e.g., lowmem_emegency_pool=16M
>
>Each megabyte of emergency pool will allow you to guarantee to be able 
>to support 256 processes (counted across all VMs that you are running). 
>So the above value would be good for 4096 processes. You'll have to 
>decide what you need to set that parameter to.

As I understand it, this is only needed to be this large because xenlinux 
allocates an entire page for the pgd where 32
bytes would be sufficient (as is done in native Linux). Wouldn't it thus make 
more sense to work towards a solution
where, like on native, the other possible pgdirs on the same page can actually 
get used. As allocation already goes
through a constructor this wouldn't seem this hard. On the other hand, if it's 
not hard, you would probably have done it
already, so I guess I'm missing something here...

Jan

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