Re: hypervisor memory usage

[Vladimir Zidar <mr_w@mindnever.org>]

Chris,

good that you pointed to 5.2 vs 5.3 vs 5.4,
the difference in number of pages is noticed between these:

       xen.gz-2.6.18-92.1.22.el5  - last 5.2 update - all pages are ok,
       xen.gz-2.6.18-128.el5 - first 5.3 release - ~80000 pages missing 
on 8GB ram setup.

Chris Lalancette wrote:
> Vladimir Zidar wrote:
>   
>> Sounds possible. However it would be great if there was switch to 
>> disable that feature in case hardware is not capable of VT-d, as I'd 
>> rather use those 300mb than have software support for something that I 
>> can't actually use.
>>     
>
> In point of fact, VT-d is disabled by default; you need to explicitly enable it
> for it to use memory.  However, it's possible that there's a bug, or some other
> change caused the memory difference, so it's worthwhile to try and track it down
> a little better.  In particular, you jumped from the 5.2 kernel to the 5.4, so
> it would be worthwhile to try the 5.3 kernel and see what you get.
>
>