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

[Håvard Bjerke <Havard.Bjerke@xxxxxxxxxxx>]

On Fri, Oct 29, 2004 at 06:24:35PM +0100, Ian Pratt wrote:
> 
> > But, in a dual CPU cluster, Intel Xenon CPU 2.40 GHz  Ethernet 
> > controller: Intel Corp. 82547GI Gigabit Ethernet Controller, we get 
> > only 1%
> > (from 114 000 KB/s -> 110 000 KB/s) performance loss.)
> 
> Good, that's the result we expect.
> 
> > Hi, we have validated the single CPU results in another single CPU 
> > cluster, and we still get an performance loss about 30%
> > (ca. 85 000 KB/s between two dom0 nodes (and NOT 114 000 KB/s),
> > Specs:
> > Ethernet controller: Intel Corp. 82547GI Gigabit Ethernet Controller
> > CPU: Intel(R) Pentium(R) 4 CPU 3.40GHz single CPU
> > RAM: 1 GB)
> 
> Hmm, have your systems got an IOAPIC, or is Xen using the legacy
> PIC code? The latter probably hasn't been thoroughly performance
> tested...
> 

The native systems can have either XT-PIC or IOAPIC, and it seems that both 
have equal performance. In Xen0, however, by looking through dmesg, there 
doesn't seem to be any IOAPIC. Is it possible to enable (or disable) IOAPIC in 
Xen0?

Håvard


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