netdev - Re: r8169 hard-freezes the system on big network loads

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Message-Id: <201109112216.33579.brade@informatik.uni-muenchen.de>
Date:	Sun, 11 Sep 2011 22:16:33 +0200
From:	Michael Brade <brade@...ormatik.uni-muenchen.de>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org, nic_swsd@...ltek.com
Subject: Re: r8169 hard-freezes the system on big network loads

On Tuesday 23 August 2011 15:17:26 Francois Romieu wrote:
> Francois Romieu <romieu@...zoreil.com> :
> [...]
> 
> > Yes. There is enough data for me to reproduce the bug with the
> > exact same chipset.
> 
> I can not generate a single rx error and the driver refuses to crash :o/
> 
> Can you apply the patch below on top of 3.1.0-rc3 and see if it makes
> a difference ?

Sorry for the delay, I have had only two days for email in the last few weeks 
and additionally kernel.org was and still is down.

Does it have to be 3.1.0-rc3 or is 3.0.1 ok as well? If so, I have another bad 
news: 3.0.1 still crashes with this patch. It took me a lot longer to crash it 
but eventually it did happen. Not sure why it took longer, I guess I didn't 
generate enough throughput.

If you want me to use 3.1.0 then we'll have to wait until git.kernel.org is 
back...

thanks,
  Michael


 
> Thanks.
> 
> diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
> index 02339b3..c54ed17 100644
> --- a/drivers/net/r8169.c
> +++ b/drivers/net/r8169.c
> @@ -5326,10 +5326,6 @@ static int rtl8169_rx_interrupt(struct net_device
> *dev, dev->stats.rx_length_errors++;
>  			if (status & RxCRC)
>  				dev->stats.rx_crc_errors++;
> -			if (status & RxFOVF) {
> -				rtl8169_schedule_work(dev, rtl8169_reset_task);
> -				dev->stats.rx_fifo_errors++;
> -			}
>  			rtl8169_mark_to_asic(desc, rx_buf_sz);
>  		} else {
>  			struct sk_buff *skb;
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