linux-kernel - Re: -rc5: e1000 resume weirdness

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Date:	Mon, 26 Mar 2007 08:50:19 -0700
From:	"Jesse Brandeburg" <jesse.brandeburg@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	auke-jan.h.kok@...el.com, "Adrian Bunk" <bunk@...sta.de>
Subject: Re: -rc5: e1000 resume weirdness

On 3/26/07, Ingo Molnar <mingo@...e.hu> wrote:
>
> hm, on a T60, after suspend/resume, i get an e1000 timeout:
>
> e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
> e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
>   Tx Queue             <0>
>   TDH                  <ec>
>   TDT                  <ec>
>   next_to_use          <ec>
>   next_to_clean        <82>
> buffer_info[next_to_clean]
>   time_stamp           <fffcc3db>
>   next_to_watch        <82>
>   jiffies              <fffd5da0>
>   next_to_watch.status <1>
>
> it works fine after that reset. The e1000 driver didnt do this before
> after resume the network was always available immediately. So this
> appears to be a relatively new regression (post-rc3 or so). high-res
> timers was disabled.

was there a "NETDEV WATCHDOG" message that follows this?  If not it is
a harmless debug print.  Note the time_stamp and jiffies difference,
very large, consistent with a resume.  I think we need to disable the
internal e1000 tx hang code that causes this debug print when we are
suspending.  I'll work with auke to generate a short patch.
-
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