netdev - Re: [REGRESSION] 2.6.24-rc7: e1000: Detected Tx Unit Hang

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Date:	Thu, 17 Jan 2008 07:40:07 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	David Miller <davem@...emloft.net>
Cc:	elendil@...net.nl, jesse.brandeburg@...el.com,
	slavon@...telecom.ru, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] 2.6.24-rc7: e1000: Detected Tx Unit Hang

Em Thu, Jan 17, 2008 at 12:00:02AM -0800, David Miller escreveu:
> From: Frans Pop <elendil@...net.nl>
> Date: Thu, 17 Jan 2008 08:51:55 +0100
> 
> > On Thursday 17 January 2008, David Miller wrote:
> > > From: "Brandeburg, Jesse" <jesse.brandeburg@...el.com>
> > >
> > > > We spent Wednesday trying to reproduce (without the patch) these issues
> > > > without much luck, and have applied the patch cleanly and will continue
> > > > testing it.  Given the simplicity of the changes, and the community
> > > > testing, I'll give my ack and we will continue testing.
> > >
> > > You need a slow CPU, and you need to make sure you do actually
> > > trigger the TX limiting code there.
> > 
> > Hmmm. Is a dual core Pentium D 3.20GHz considered slow these days?
> 
> No of course :-)  I guess it therefore depends upon the load
> as well.

I saw it just once, yesterday:

[root@...pio ~]# uname -r
2.6.24-rc5
e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
  Tx Queue             <0>
  TDH                  <58>
  TDT                  <8f>
  next_to_use          <8f>
  next_to_clean        <55>
buffer_info[next_to_clean]
  time_stamp           <105e973a9>
  next_to_watch        <56>
  jiffies              <105e97992>
  next_to_watch.status <1>
[root@...pio ~]#

on a lenovo T60W, core2duo machine (2GHz), when using it to stress test
another machine, I was using netperf TCP_STREAM ranging from 1 to 8
streams + a ping -f using various packet sizes.

I'll update this machine today to 2.6.24-rc8-git + net-2.6 and try again
to reproduce.

I also applied David's patch while trying some RT experiments on
another, 8 way machine used as a server, but on this machine I didn't
experience the Tx Unit Hang message with or without the patch.

- Arnaldo
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