Re: [Xen-devel] Design document of Kemari

[Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>]

John Levon wrote:
> On Sat, Mar 07, 2009 at 01:48:22AM +0900, Yoshiaki Tamura wrote:
>
> > I believe Kemari and Remus shares a lot in common.
> > Stephen and Ian have described both Kemari and Remus on the roadmap 
> > document, and that might help for quick review.
> > http://blog.xen.org/index.php/2008/12/08/xen-roadmap-document-2/
> >
> > In short, Kemari transfers the guest VM on event-driven, while Remus 
> > transfers on specific interval.
> Thanks. Do you have performance numbers? It sounds like your approach is
> intended to give lower I/O response latencies, but Remus will give
> better throughput with high I/O load as it doesn't sync on every single
> outgoing I/O.
Thanks for your interest.
Although the numbers are old, you can get an extended abstract and slides which 
I used at Xen Summit from http://www.osrg.net/kemari
The patchset I sent today seems to perform a lot better, but I don't have papers 
yet.
Regarding the throughput, possible idea is to buffer some events to reduce the 
frequency, which would introduce latencies as a trade off. Although we haven't 
implemented this feature yet, it may be interesting how the numbers change.
> If both projects are indeed headed for the tree, people are going to
> need some ideas of which to use...
Well, I sent the following message when I open-sourced Kemari in November.

http://lists.xensource.com/archives/html/xen-devel/2008-11/msg00682.html

Thanks,

Yoshi



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