[Xen-devel] Re: oxenstored in stubdom ?

[Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxxx>]

On 21/08/10 23:39, Åukasz OleÅ wrote:
> Hi,
>
> recently on irc channel (##xen) was some "discussion" about xen vs kvm...
>
> There was idea that it would be nice if domUs could survive dom0 restart, but
> this needs, for example, to have xenstored running in separate domain.
>
> In 2009 Alex Zeffertt posted some patches
> (http://lists.xensource.com/archives/html/xen-devel/2009-04/msg00696.html) to
> add this functionallity, but they weren't applied.
>
> So.. having xenstore in separate domain can have other advantages
> (performance?).
> Is it (or will be) possible  run oxenstroed in stubdomain?
oxenstored is already restartable (or used to be and easy to fix if it 
was broken), so from a xenstore point of view, you could already restart 
dom0; Obviously this would block all the domains that try to do a 
xenstore query, but if the dom0 is restarted quickly enough this 
shouldn't be too noticeable since a normal working domain shouldn't use 
much xenstore after starting up.
Regarding performance nobody profiled oxenstored in this context as far 
as i know; I'm not sure that would be a win, and i would much rather 
squeeze performance in the code directly than move xenstored in a 
complicated setup.
--
Vincent

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