e1000_watchdog_task: NIC Link is Up/Down on kernels 2.4.15 2.4.14

[Lukasz Trabinski]

Hello

I have machine with build in ethernet interafce, system is Linux Fedora 
Core 4.
Ethernet controller: Intel Corporation 82541GI/PI Gigabit Ethernet 
Controller. It's connected to cisco Catalyst 4000 switch:

#show interface GigabitEthernet3/5

GigabitEthernet3/5 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is xxx
  Description: xxx
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is off, output flow-control is off


configuration on switch interface:

interface GigabitEthernet3/5
 switchport mode access
 switchport nonegotiate
 logging event link-status
 no cdp enable
end



on linux machine:

[root@w3cache ~]# ethtool eth0
Settings for eth0:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: umbg
        Wake-on: g
        Current message level: 0x00000007 (7)
        Link detected: yes

Some times I observe flaping eth0 interface:

Jan  5 18:31:19 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Down
Jan  5 18:31:21 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Up 1000 Mbps Full Duplex
Jan  5 18:31:25 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Down
Jan  5 18:31:27 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Up 1000 Mbps Full Duplex
Jan  5 18:56:30 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Down
Jan  5 18:56:33 w3cache kernel: e1000: eth0: e1000_watchdog_task: NIC Link 
is Up 1000 Mbps Full Duplex

Patchcords and other physical layer is OK. Tested kernels 
kernel-2.6.14-1.1653_FC4 and latest vanilla 2.4.15. I have tried set full 
duplex, speed 1000 on switch but it's happan again.
On cisco switch i don't have seen any flaps this interface or any errors.

Any idea? Thank You.

I have also commited this problem to redhat bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=177043


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ŁT
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