FEX 6800-IA interface high drop rate and high overrun counters combined with slow throughput.

The interface drop rate count arises and the traffic throughput gets down to 15% of the nominal data rate of the 1Gb interface when a server with a 10Gb interface send data to a client connected at 1Gb FEX interface.
How must I configure the interface to achieve nearly 100% of 1Gb?
Client to Server: 100% of 1Gb; Sever to Client 15% of 1Gb
Server ---(10Gb)--- Nexus7010-- (10Gb)--- C6880-X----(10Gb)---FEX----(1Gb)Client

Sorry, yes of course:
Server ---(10Gb)--- Nexus7010-- (10Gb)--- C6880-X----(10Gb)---6800-IA----(1Gb)---Client

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Hello,
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FEX 6800-IA interface high drop rate and high overrun counters combined with slow throughput.

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