Xen devel - Jul 2005 - disk I/O QoS in 3.0?

On the Xen RoadMap for 3.0 a feature listed is:

"Enhanced QoS features. Xen already enables control over the CPU and
network usage of domains, but we plan to improve this support by adding
soft real-time scheduling capabilities to enable upper and lower bounds
to be set on a domain''s resource usage. Providing better tools support
for disk scheduling and accounting is important too."

I keep track of the code changes and haven''t seen anything specifically
for improved disk I/O accounting and QoS.  Has worked been done on this
(or perhaps something I missed) or is this a feature that we should not
expect to see?

-- 
Thanks,
Matt Ayres


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> I keep track of the code changes and haven''t seen anything 
> specifically for improved disk I/O accounting and QoS.  Has 
> worked been done on this (or perhaps something I missed) or 
> is this a feature that we should not expect to see?
Nothing has been checked in yet, though its actually pretty trivial: its
just a case of tagging requests with the domain they came from and then
Linux''s normal IO scheduler infrastructure can take care of it. We can
wrap it with a few xm commands to make it easier to configure.
Volunteers?

Ian

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