Re: [Xen-devel] Xen & I/O in clusters - Single Vs. Dual CPU issue

[Rune Johan Andresen <runejoha@xxxxxxxxxxx>]

Well, after the issue between two xen dom0 domains is solved there is a 
new case we don't
understand:

With two physical domains and 4 guest OSs (2 on each physical node) we 
get some rare results with ttcp (b=1000000, l = 1000000):
Lets say we have two guest OSs on physical node A, A1 and A2, and two 
guest OSs on physical node B, B1 and B2.
Between A1 and B1 I get 110 000 KB/s (which is almost optimal!)
Between A1 and B2 I get 81 0000 KB/s
Between A2 and B1 I get 94 000 KB/s

Do you have any idea why we get less performance in the last two cases? 
It doesn't make sense. It cant be
a bottleneck in the network either because of case 1.(?)

Cheers,
Rune


On Nov 2, 2004, at 5:51 PM, Mark A. Williamson wrote:

> > If you're using MPI over TCP/IP (which I imagine you are) then it 
> > should
> > Just Work (TM).  We have tried live migration with MPI applications 
> > but you
> > shouldn't have any problems moving the VMs around with a cluster.
> Sorry I meant to say we have *not* tried live migration with MPI 
> applications.
> Note to self: read before clicking send!
>
> Cheers,
> Mark
>
>
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