Re: [Xen-devel] migration

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

Ian Pratt wrote:
> > > Live migration is a lot more "exciting" from an 
> > > implementation point of view than stop-and-copy, so if you do 
> > > have bug reports it would be very useful to know whether you 
> > > can repeat them in stop-and-copy mode. 
> > I was logged in the whole time and there was about 1/2 a second where it
> > seemed to freeze, but no bugs to report.
>
> With the old xend and old IO we used to get live migration times
> downtimes in the order of <50ms for quiescent domains.
>
> I'm confident we can get back to that order of performance with a
> few tweaks Mike and I are currently working on.
hi,

I have an alternative implementation, where live-migration takes place 
entirely within the guest domain. It is currently only implemented for 
Linux 2.4, and in the old 1.3 I/O model. It has (in my opinion) a few 
benefits, because Linux is able to make better informed decisions during 
migration than Xen is.
My hope is to someday be compatible with the latest and greatest 
Xen-version, so I have not released any source for this yet. However, if 
you are interested, let me know and I can send you my patches for 
XenoLinux (no changes to Xen needed), or some binaries to play with.
There is a short paper describing my approach at 
http://www.diku.dk/~jacobg/nomadxen.pdf
best,
Jacob


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