netdev - Re: [GIT]: Networking

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Message-ID: <20080614081656.GA27820@elte.hu>
Date:	Sat, 14 Jun 2008 10:16:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org, rjw@...k.pl
Subject: Re: [GIT]: Networking


* David Miller <davem@...emloft.net> wrote:

> > just to clarify the bug pattern: the box was still accessible after 
> > the warning. So this is a far less serious problem and i'd suggest 
> > we open up a separate regression entry for it and consider the 
> > hung-TCP problem closed. (i havent seen the hang in the last week, 
> > with either version of the tcp-accept reverts)
> 
> It is a warning that just means the transmitted on the network device 
> stalled for an unusually long period of time.  Is your subnet flooded 
> when these warnings occur?  Is the remove side system wedged or at a 
> very high load when the message triggers?

yes, both the network and the testbox is at relatively high load, it's a 
distcc kernel build over the network. Thousands of such iterations were 
done successfully without this warning ever triggering - it triggered 
for the first time in about 10,000 bootups the moment i applied your 
version of the reverts. When i applied the small diff the warning did 
not come back.

> All of these would be useful points of information to determine if 
> this might be normal or not.
> 
> In theory, if the remove port the device is connected to gets 
> extremely congested, emits a pause frame to your machine, but never 
> releases that pause, this (new) warning could trigger.
> 
> This warning was added by Arjan in 2.6.25 FYI in order to diagnose the 
> not-normal cases better.

ok, should we then remove that warning, if it's spurious? kerneloops.org 
has picked up a few other instances of this warning as well:

  http://www.kerneloops.org/searchfile.php?search=net%2Fsched%2Fsch_generic.c&btnG=Filename+Search

	Ingo
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