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NX_NIC driver 4.0.579 BUG - slow NFS client

gepeng1983
Occasional Collector

NX_NIC driver 4.0.579 BUG - slow NFS client

catching a bug in 4.0.579
NFS client was very slow (4.5MB/s at 10GbE connection), matched by "transport xxxxx not enqueued" on the server side.
Symptom gets away when reverted to non-HP "stock" kernel driver that came with the linux distribution (Red Hat kernel 2.6.32-220.4.1, netxen_nic driver). Not sure if earlier drivers like 4.0.566 works or not.
all fireware up to date.
the problem onset at the upgrade of kernel from 2.6.32-131 to 2.6.32-220.4.1.
client: HP DL370 G6 with NC524SFP
server: HP DL180 G6 with NC522SFP

however, even before upgrading kernel from 2.6.32-131, another client with HP DL180 G6 with NC522SFP already has the slow NFS problem.