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Re: wm0 Ierrs




On Mar 27, 2008, at 8:36 AM, Gregory Boehnlein wrote:
Hello,
I am using an iSCSI target based on NetBSD from Wasabi systems. The
NetBSD kernel is identified as:

Wasabi's NetBSD was/is not stock NetBSD. I would suggest contacting them for support.



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.





-- thorpej



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