Re: [Xen-devel] hypervisor memory usage

[Vladimir Zidar <mr_w@xxxxxxxxxxxxx>]

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.
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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