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Date: Tue, 13 Jan 2009 16:19:22 -0500 (EST)
From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: linux-kernel@vger.kernel.org
cc: Alan Piszcz <ap@solarrain.com>
Subject: 2.6.28: r8169: NETDEV WATCHDOG: eth0 (r8169): transmit timed out
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Most likely disabling this (onboard-nic) and using Intel PCI-Express 1 
Gbps card but FYI:

[505628.695393] ------------[ cut here ]------------
[505628.695398] WARNING: at net/sched/sch_generic.c:226 dev_watchdog+0x22e/0x240()
[505628.695400] NETDEV WATCHDOG: eth0 (r8169): transmit timed out
[505628.695403] Pid: 0, comm: swapper Not tainted 2.6.28 #1
[505628.695405] Call Trace:
[505628.695407]  <IRQ>  [<ffffffff8024f628>] warn_slowpath+0xc8/0x110
[505628.695416]  [<ffffffff805b9310>] ip_finish_output+0x0/0x2b0
[505628.695419]  [<ffffffff8059e3e4>] eth_header+0x34/0xd0
[505628.695423]  [<ffffffff804078c9>] __next_cpu+0x19/0x30
[505628.695427]  [<ffffffff802472dc>] find_busiest_group+0x1dc/0x970
[505628.695432]  [<ffffffff802308b9>] read_tsc+0x9/0x20
[505628.695436]  [<ffffffff802599c4>] lock_timer_base+0x34/0x70
[505628.695440]  [<ffffffff8026aa98>] getnstimeofday+0x48/0xc0
[505628.695443]  [<ffffffff8040d601>] strlcpy+0x41/0x50
[505628.695447]  [<ffffffff8059e9fe>] dev_watchdog+0x22e/0x240
[505628.695449]  [<ffffffff802308b9>] read_tsc+0x9/0x20
[505628.695453]  [<ffffffff8059e7d0>] dev_watchdog+0x0/0x240
[505628.695456]  [<ffffffff802594be>] run_timer_softirq+0x12e/0x200
[505628.695460]  [<ffffffff80238c35>] lapic_next_event+0x15/0x20
[505628.695463]  [<ffffffff80254e13>] __do_softirq+0x93/0x160
[505628.695467]  [<ffffffff802684c2>] hrtimer_interrupt+0x152/0x1c0
[505628.695471]  [<ffffffff8022aabc>] call_softirq+0x1c/0x30
[505628.695474]  [<ffffffff8022c455>] do_softirq+0x35/0x70
[505628.695477]  [<ffffffff802394f6>] smp_apic_timer_interrupt+0x86/0xd0
[505628.695480]  [<ffffffff8022a50b>] apic_timer_interrupt+0x6b/0x70
[505628.695482]  <EOI>  [<ffffffff805f0320>] unix_poll+0x0/0xb0
[505628.695489]  [<ffffffff8023147c>] mwait_idle+0x3c/0x50
[505628.695493]  [<ffffffff80228a1c>] cpu_idle+0x5c/0x90
[505628.695495] ---[ end trace eddb8da7fddd6198 ]---
[505628.700048] r8169: eth0: link up

I believe this occured when trying to burn a DVD via Nero over a 1gbps 
connection.

Justin.