Re: [Xen-ia64-devel] Shortage of Xen heap problem

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi,

Sorry, I forgot that. To map extended heap pages, assuming 64MB page, 
I need 1 TR entry/4CPU. Is it OK to consume that much of TR entries? or
Should I use 256MB page ?

Best Regards,
 Kan

Magenheimer, Dan (HP Labs Fort Collins) wrote:
>Is it assumed that the entire Xen heap is mapped by
>a TR?   If so, expanding the Xen heap size might
>cause problems. 
>
>> -----Original Message-----
>> From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 
>> [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf 
>> Of Masaki Kanno
>> Sent: Tuesday, December 20, 2005 1:11 AM
>> To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-ia64-devel] Shortage of Xen heap problem
>> 
>> Hi,
>> 
>> When Xen SMP is supported, it becomes Xen heap shortage with 
>> 3 CPUs or more.
>> Because Xen heap is required 16MB per CPU for VHPT. 
>> (Refer to attached file Xenheapshortage.txt)
>> 
>> I think that I will expand the size of Xen heap according to 
>> the value of NR_CPUS. 
>> I have the idea as follows.
>> 
>> #ifdef CONFIG_SMP
>>   Xen heap size = 63MB(default) + 16MB * NR_CPUS;
>> #else
>>   Xen heap size = 63MB(default);
>> #endif
>> 
>> Any idea and comment?
>> 
>> Best Regards,
>>  Kan
>> 
>> 

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