em driver regression

[Mike Tancsa]

At 12:52 PM 4/8/2010, Jack Vogel wrote:
>Mike, I noticed this connection is only 100Mb, that isn't 
>accidental? And, is it possible for
>you to check a connection at 1Gb and see if the watchdogs don't happen.
>
>My test engineer is running this code, and we are having trouble 
>repro'ing the issue, so any
>clues might help. Is the kernel 64 or 32 bit?

It is a 32 bit kernel (see the attached dmesg from the first email) 
in a cisco 10/100 switch. I just tried and the dhclient issue happens 
at gig speeds as well.

Apr  8 13:34:29 ich10 dhclient[1480]: DHCPREQUEST on em0 to 
255.255.255.255 port 67
Apr  8 13:34:35 ich10 dhclient[1480]: DHCPREQUEST on em0 to 
255.255.255.255 port 67
Apr  8 13:34:48 ich10 dhclient[1480]: DHCPDISCOVER on em0 to 
255.255.255.255 port 67 interval 5
Apr  8 13:34:48 ich10 dhclient[1480]: ip length 328 disagrees with 
bytes received 332.
Apr  8 13:34:48 ich10 dhclient[1480]: accepting packet with data 
after udp payload.

0(ich10)# ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
         options=399b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
         ether 00:1c:c0:95:0d:0d
         inet 192.168.xx.219 netmask 0xffffff00 broadcast 192.168.xx.255
         media: Ethernet autoselect (1000baseT <full-duplex>)
         status: active
0(ich10)#


... As for the watchdog issue, it just seems to show up. I am not 
able to reproduce it on demand. However, the dhclient issue happens 
all the time. I will give it a whirl on a gigabit for a day and see.

Its not that frequent

Apr  7 02:19:05 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 03:46:51 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 08:04:03 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 10:39:40 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 11:12:34 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 13:25:26 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 14:01:36 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 17:19:53 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 21:16:45 ich10 kernel: em0: Watchdog timeout -- resetting
Apr  7 22:09:10 ich10 kernel: em0: Watchdog timeout -- resetting

But it should in theory show up at least once in 24hrs if its not a 
port speed issue.

A potential 3rd issue I also noticed is that this morning I could not 
login to the box-- but I could ping it, but no SSH banner. ie no 3way 
handshake completing.  I was able to 'fix' the issue by logging onto 
the console, initiating some outbound tcp traffic (ie. ssh out from 
the box) and then I could login again. Perhaps a TSO issue ? I now 
have a firewire console hooked up so I can login out of band. If this 
issue comes up again, how can I best narrow down what/where this 3rd issue is ?

         ---Mike


--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike