Hi,
We are experiencing some network limitations on our virtual machines, we have done some initial testing to pinpoint the exact issue.
Hardware:
2 x 25G NICs per physical machine
2 x 100G interlinks between datacenters

iPerf test between two VMs in same host on same cluster and same datacenter reveals ~20GB/s (what is more or less expected)
iPerf test between two VMs in differet host on same cluster and same datacenter reveals ~20GB/s (what is more or less expected)
iPerf test between two VMs in differet host on different cluster and different datacenter reveals ~10GB/s (what is half or less than expected)

There are no firewalls or other identified blockeing equipment between the datacenters.

The only difference, as I see it, are traffic going across the 100G interlinks.
Are there anything that needs to be tuned / setup in the NICs either on the VM or the host to be able to get higher speed between the datacenters?

/John
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