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



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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