Re: [Xen-devel] disk throttling

[Jacob Gorm Hansen <jacob@xxxxxxxx>]

Mark A. Williamson wrote:
> > Has the plan of turning Xen into a next-gen BIOS been scrapped? It seems
> > Xen is becoming more and more dependent on having a specific version of
> > Linux as dom0?
>
> Our proposed next-gen architecture now consists of:
> * Safe Hardware Interface - restricted access to machine resources (memory, IO 
> regions...).  Provided by Xen itself.
> * Next gen "BIOS controller" - general machine management...  It runs all the 
> time rather than just at bootup.
> * Driver domains - device drivers scheduled pre-emptively, with restricted 
> hardware access
> * Virtual machines - run user applications
In this setup, where would stuff like the net filter be placed? In the 
network driver domain? How would one register the IP address of a new 
domain?
It would be really cool to be able to run without a full Linux just for 
drivers.  How much work do you think it would be to port one of the 
pre-NGIO Xen drivers to run in a separate VM?
I know you guys focus primarily on server-class machines, but I am 
dreaming of running Xen on a 1000+ node cluster we have here, and with 
the current mem usage of dom0 (according to postings on this list it has 
a hard time coping on 32megs or less), this would waste at least 32 
gigabytes of mem, just for dom0s.
Jacob


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