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Re: [Xen-devel] Re: xen, OpenMosix + pretty gui = virtual iron killer

My guess is they didn't solve false sharing problems at all, and on top of that the true sharing issues will always stay there.

Especially the slab allocator of Linux is bound to create lots of false and true sharing.

Moshe


On Feb 21, 2005, at 7:43 PM, David Rottenburg wrote:


Orran Y Krieger <okrieg <at> us.ibm.com> writes:


The impression I got from a couple of questions to
the speaker was that they supported DSM in the hypervisor, and that the
Linux was not terribly aware.  OpenMosix + Xen could do much better
I think. Interesting synchronization questions to be worked out though.
           -- Orran> Date: Fri, 18 Feb 2005 11:04:35 -0000
To: "Denis Bohm" <denis <at> fireflydesign.com>,
   "Jerry Normandin" <jerryn <at> nfnnet.org>
Subject: Re: [Xen-devel] xen, OpenMosix + pretty gui = virtual iron
killer

My understanding was that they completly virtualize the underlying hardware to construct a large virtual SMP without any mods to the Linux kernel, very different than what Xen does with its paravirtualization approach. I wonder
how they solved false sharing problems in the kernel.

David




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