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Re: [Xen-devel] disk throttling

To: Jacob Gorm Hansen <jacob@xxxxxxxx>
Subject: Re: [Xen-devel] disk throttling
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Fri, 12 Nov 2004 14:56:53 +0000
Cc: mark.williamson@xxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxxx
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In-reply-to: Your message of "Fri, 12 Nov 2004 14:30:17 +0100." <4194BAE9.3030405@xxxxxxxx>
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> 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?

As you know, Xen itself isn't dependent on anything much -- but a
machine with just Xen and no domain 0 doesn't actually do anything. 
Any domain 0 which can provide the requisite functionality
(control tools and backends mainly) is fine -- we're currently using
linux 2.6.9 for this as it seems the logical choice (lots of
functionality, mature code base, widespread user knowledge).

If someone wants to write a 'custom' OS for dom0 to address some 
perceived overhead, then they should feel free to. It probably 
could be quite a lot smaller than linux. 

Even in this case, however, we're extremely likely to retain linux
2.6.x as a recommended backend platform due to the wide-ranging
hardware support. The 1.2-style notion of writing new drivers to run
within Xen is effectively untenable unless folks are prepared to spend
a hell of a lot of time writing + testing driver code...



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