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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Xen and I/O Intensive Loads
On Wednesday 26 August 2009 15:00:39 Javier Guerra wrote: > On Wed, Aug 26, 2009 at 12:57 PM, Nick Couchman<Nick.Couchman@xxxxxxxxx> wrote: > > I've changed the dom0 elevator to noop and the domU to deadline. > > shouldn't that be the other way around? I see what you mean, but it's really what I meant (as described in another message). The noop@dom0 is to lower (the already high) IO latency and leave all optimizations to the storage to do, at least in theory. In _my_ SAN, though, it's still worth using a local IO scheduler (though noop is ok). If you don't have at least a decent hardware-RAID controller with write cache enabled, then it's a no-no. About deadline@domU, that's perhaps even more peculiar. Apparently. domU pestering dom0 too often with IO requests degrades performance, at least in xen 3.0.x. -- Daniel Mealha Cabrita Divisao de Suporte Tecnico AINFO / Reitoria / UTFPR http://www.utfpr.edu.br _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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