zfs discuss - Aug 2010 - ZFS / Network tuning recommendations for iSCSI

I have seen some network recommendations for tuning a small storage server
from the network side.  I am currently using this set and wondered if there
were other things I should be tweeking,

ndd -set /dev/tcp tcp_xmit_hiwat        1048576
ndd -set /dev/tcp tcp_recv_hiwat        8388608
ndd -set /dev/tcp tcp_max_buf           8388608
ndd -set /dev/udp udp_xmit_hiwat        1048576
ndd -set /dev/udp udp_recv_hiwat        8388608
ndd -set /dev/tcp tcp_conn_req_max_q    65536
ndd -set /dev/tcp tcp_conn_req_max_q0   65536
ndd -set /dev/tcp tcp_fin_wait_2_flush_interval 67500
ndd -set /dev/tcp tcp_naglim_def        1

I realize the UDP options have nothing to do with iSCSI, but I applied them
anyway as it seemed to make sense.

The machine I?m using  has a 8 drive RAIDZ-2 with 1 TB drives a quad core
processor and 4 GB RAM.  98% of its load is as an iSCSI target for ESX.    I
do have write caching turned on and have verified that turning it off causes
a significant write performance penalty.   I currently am not using bonded
NICS, but am using jumbo frames.   Are there other things I should be
tweeking?

--
Terry Hull
Network Resource Group, Inc.
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