[Xen-devel] Re: Xen & I/O in clusters - problems!

[Håvard Bjerke <Havard.Bjerke@xxxxxxxxxxx>]

Here are some details on our horrible benchmark results:


System setup:

Ethernet controller: 
        Intel Corp. 82547GI Gigabit Ethernet Controller

Benchmark: 
        PARKBENCH low-level pingpong benchmark comms1_mpi

MPI library: 
        Scali MPI (http://www.scali.com/)

Xen distribution: 
        2.0 stable, downloaded with bitkeeper

Xen configuration: 
        default, i.e. we just leave config-2.6.8.1-xen0 the way it is

CPU: 
        Single Intel(R) Pentium(R) 4 CPU 3.40GHz

Memory: 
        1 GB


Bandwidth measurements:

Between two nodes running plain redhat EL3 with kernel 2.4.21-15.EL:

        786.034 MByte/s

Between two nodes each running only xen domain 0:

        56.480 MByte/s

A graph over the measurements - x = message length, y = time:

        http://www.idi.ntnu.no/~havarbj/tmp/plot.png


Cheers,
Havard


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