What do you think of (real) iSCSI HBA like Qlogic cards under linux ?
We are using open-iscsi now with bnx2 cards and the perfs are far from
decent (top 50/100Mbps),
some comparative tests on an intel e1000 card show betters results
(500/600Mbps) but
far from gigabit saturation, and still high latency.

I'm using the following sysctl:

# increase TCP max buffer size
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216

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