Streaming perf problem on 10g

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Hi All,

I am running into a performance problem with 2.6.32-23 Ubuntu lucid on both client and server.

The disk is an SSD performing at 1.4 - 1.6Gbps for a dd of a 6gb file in 64k blocks.

The network is performing fine with many Gbps of iperf throughput.

Yet, the dd write performance over the nfs mount point ranges from 96-105 Mbps for a 6gb file in 64k blocks.

I've tried changing the tcp_slot_table_entries and the wsize but there is negligible gain from these.

Does it sound like a client side inefficiency?

Thanks
-Shehjar
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