Ive got HP NC522SFP cards in my hp dl360 (g6 and g7) hosts.
The performance in our enviroment is Horrible.
Ive got a seperate vswitch bound to our 10gbe nc522sfp interface. Copper mulimode cables run from the 10GBe SFP to our Procurve Switch....which inturn is connected to our storage via 10gbe. The storage is all SSD.
I show no errors or dropped packets in the switch. The 10gbe interface reads as 10gbe full duplex in both VMware and the switch.
THe 10gbe cards have the latest firmware:
driver: be2net
version: 4.1.334.0
firmware-version: 4.1.402.8
and the latest drivers from HP for vmware have been loaded.
Now the Odd part.
I cant seem to get more than about 20MB/sec in vmware with a seq copy of a 20gig file. Random gets way way worse (5 or less MB/Sec)
I have tried:
Using 2 virtual machines on different datastores (on same san).
Using 2 Virt machines on the same datastore.
Tried different san configurations (raid5, raid6, tiered, compressed, uncompressed).
Jumbo frames from end to end
Round Robing (recommended) and Fixed policies
Nothing makes a difference.
I have tested with a windows box over a 1gb interface and i get 150 - 400MB/sec to the storage. This leads me to believe it is either the NC522 cards or the vmware 4.1 itself.
I have yet to test with a 10GBe interface in windows but plan to do that soon.
Can anyone provide any insight or ideas? Im running out of them myself.
I realize this post is a bit vague but it is hard to get real specific now that im this confused 
Feel free to ask questions to get any information out of me that might help to troubleshoot.