Re: [Patch][resend] implementation of cpupool support in xl

[Juergen Gross <juergen.gross@ts.fujitsu.com>]

On 09/16/10 07:58, Vasiliy G Tolstov wrote:
> Sorry for may be breaking thread, but what benefits of using cpu pool in
> Xen? Can You provide some use cases for using cpu pools?

Without cpu pools the whole Xen server is running one scheduler which is
scheduling all domains on all cpus (possibly with some restrictions due to
cpu pinning). With cpu pools each pool is running it's own scheduler
responsible only for some cpus and some domains. This may be important if
you want to:
- isolate some domains from others regarding cpu usage
- restrict a group of domains to a subset of cpus (e.g. due to license
   restrictions), while scheduling parameters should still be working (this was
   our main problem without cpu pools: scheduling weights and cpu pinning are
   not working together very well)
- use different scheduling strategies for different domains (e.g. credit
   scheduler for some domains and credit2 or sedf for others)

For an extended discussion on cpu pools please see:
http://lists.xensource.com/archives/html/xen-devel/2009-07/msg01116.html


HTH Juergen

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Juergen Gross                 Principal Developer Operating Systems
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