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

[Rune Johan Andresen <runejoha@xxxxxxxxxxx>]

Hi, we benchmark with Scali MPI. We are in the first stage with an easy 
ping program which
first send 1 byte to measure the latency, then we tested with 10^5, 
10^7 and 10^8 size packages. We also
get the same results when sending from domain0 to domain0 in the 
cluster. We are now testing if the routing table
is the bottleneck, I let you know the results. Thank you :)

Cheers,
Rune J.A

On Oct 15, 2004, at 1:24 AM, Mark A. Williamson wrote:

> > When we benchmark from a virtual domain  (running on Xen on a physical
> > node) to an another virtual domain (on another physical node) we get
> > 56.480 MByte/s (1:16)
> Ouch.  How are you benchmarking this?  (what tool, what parameters, 
> etc.).
> It'll help me reproduce this on our test systems.  Then we'll know if 
> it's
> your config or if there's something to track down.
>
> We did see some weird performance for small packets at one stage and 
> I'm not
> sure if that was ever resolved.  If it's the same problem, I can do a 
> binary
> chop search of changesets in order to locate it.
>
> Cheers,
> Mark

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