On Thu, Apr 21, 2005 at 12:39:55PM -0400, Marc E. Fiuczynski wrote: > > Marc E. Fiuczynski wrote: > > >What's the status with the IO controller? Got an ETA? > > > > > > > > The UofM team (Florin Iucha, Hal Peterson and Eugene Vasserman) will > > try to implement an IO controller based on cello. We should have > > something by April or May, although we won't be able to guarantee > > fitness or merchantability for any purpose ... ;) > > What is the status of your cello-based I/O controller?
We are making some progress, but due to the learning curve required and time constraints we focused on the performance isolation aspect of the scheduler, so classes will get their guaranteed disk bandwidth share, but within the class we will use the noop scheduler. We will publish our patch and hope to continue it by making it more robust and migrating to at least the deadline scheduler. florin -- Don't question authority: they don't know either!
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