Data rate issue with 6880-X in combination with NX1000v

[hsticher]

Hi folks,

we've a data rate issue with our 6880-X VSS in combination with our servers connected at  NX1000V switch.
The data rate by  sending from a server connected at NX1000V switch  to a client connected at a 6880-X VSS FEX-port is about 1/7 of the data rate by sending data from the client to the server.
This means in Bytes per seconds: Server to client
Send:         17 KBytes/s
Receive:   114 KBytes/s
or client to server
Send:      114 KBytes/s
Receive:   17 KBytes/s
Sending and receiving data rate from the client connected at a 6880-X VSS FEX-port to a server not connected at a NX1000v is equal.
Send:        114 KBytes/s
Receive:   114 KBytes/s

Does anyone any idea what's the reason could be?

[hsticher]

It seems,  the reason for the slow download rate results from the fast 10Gb server interface and the slower 1Gb client interface. The server send to fast for the client, but how can I tell the server to reduce the traffic rate so that the client can manage it?
Which is the proper configuration at the 6880-X for the FEX-Interfaces?