I did some more experiments today.
1) Both target and initiator connected to the same switch (3com-5500). I've 
turned on flow-control on both ports.
2) I've run iperf:
[EMAIL PROTECTED] iscsi]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 172.16.32.11 port 5001 connected with 172.16.38.32 port 56335
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.08 GBytes    926 Mbits/sec

Looks like ok.
3) Turned on InitialR2T on Initiator.
4) Set qlog-lvl on target to 0x80000077 - nothing new in target_log
5) Created zvol on simple zfs pool. Before it was raidz1 pool.

Nothing changed at all. mkfs.ext3 starts pretty fast, but stucks in about 1 sec.

Whats more can be done here?

Regards,
Eugene
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