wm0 Ierrs

["Gregory Boehnlein" <damin%nacs.net@localhost>]

Hello,
      I am using an iSCSI target based on NetBSD from Wasabi systems. The
NetBSD kernel is identified as:

NetBSD iscsi.n2net.net 3.99.17 Wasabi NetBSD 3.99.17
(SBLDR_ISCSI_GENERIC-WWM-$Revision: 1.1.4.7 $) #0: Wed Oct 31 18:41:06 UTC
2007  support%wasabisystems.com@localhost i386

I have had decent success w/ the product, but I'm looking for some sanity
checks and possible pointers to some options for the driver that may help
put my mind at ease.

Basically, I am seeing input errors on the wm driver:

iscsi# netstat -in
Name  Mtu   Network       Address              Ipkts Ierrs    Opkts Oerrs
Colls
wm0  1500  <Link>        00:15:17:55:44:b0 85918802   880 51402271     0
0
wm0  1500  fe80::/64     fe80::215:17ff:fe 85918802   880 51402271     0
0
wm0  1500  10.0.2/24     10.0.2.254        85918802   880 51402271     0
0
wm1  1500  <Link>        00:15:17:55:44:b1 124213539  1471 60221587     0
0
wm1  1500  fe80::/64     fe80::215:17ff:fe 124213539  1471 60221587     0
0
wm1  1500  10.0.3/24     10.0.3.254        124213539  1471 60221587     0
0
fxp0  1500  <Link>        00:07:e9:1a:64:57  1280704     0    25223     0
0
fxp0  1500  fe80::/64     fe80::207:e9ff:fe  1280704     0    25223     0
0
fxp0  1500  192.168.2/24  192.168.2.210      1280704     0    25223     0
0
lo0   33192 <Link>                                 0     0        0     0
0
lo0   33192 127/8         127.0.0.1                0     0        0     0
0
lo0   33192 ::1/128       ::1                      0     0        0     0
0
lo0   33192 fe80::/64     fe80::1                  0     0        0     0
0

The input error percentage is small.. 0.0011%, but I am trying to see if I
can do anything to clean it up. Here is what I've done so far:

1. Verified / replaced cabling to the switches (no change)
2. Replaced the switches (no change)
3. Verified that Flow Control is disabled at the Switch level

Any other suggestions on what I should be looking at? What about Interrupt
Coalescence on the hardware? Under Linux, it's standard practice that we
disable Interrupt Throttling (at the expense of a little cpu) to reduce
latency and increase performance across the network, but I'm not sure how to
accomplish the same thing in a NetBSD environment.

Thanks in advance for any suggestions.