Re: [Xen-devel] hypervisor memory usage

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Oct 28, 2009 at 01:02:14PM +0100, 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.
> 
> Thanks for hints, you were very helpful.
> 
> I'll dig more into rhel/centos xen sources to look for any reference to 
> vt-d.
> 

It could also be some other feature/change..

Maybe this helps: http://rhn.redhat.com/errata/RHSA-2009-1243.html

(there's the changelog in the end).

-- Pasi

> Pasi Kärkkäinen wrote:
> >> I understand that this could be due to rhel patches, and maybe 
> >>doesn't relate to official xen builds, but I'd like to know if this 
> >>issue was known or not before jumping into xen 3.4 - as it won't be 
> >>direct rpm/yum upgrade path.
> >>
> >>    
> >
> >RHEL 5.4 (-164 kernel) added more support for VT-d etc, so maybe that's why
> >more DMA memory is reserved. dunno.
> >
> >-- Pasi
> >  
> 
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