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

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Message-Id: <201108141308.28140.kjun-chen@sambodha.org>
Date:	Sun, 14 Aug 2011 13:08:28 +0200
From:	Kjun Chen <kjun-chen@...bodha.org>
To:	netdev@...r.kernel.org
Cc:	romieu@...zoreil.com, nic_swsd@...ltek.com
Subject: r8169 hard-freezes the system on big network loads

Hi,

as I have mentioned to linux-kernel, this is perfectly reproducible: receiving 
70 MB/s or more freezes my laptop (Dell Vostro, amd64, 6 GB RAM, 8x Intel Core 
i7 CPU Q 740 @ 1.73GHz) completely, sometimes within seconds, sometimes only 
after a minute.

Watching the normal console I get loads of

r8169 0000:13:00.0: eth0: link up
r8169 0000:13:00.0: eth0: link up
[...]

one message about every 1-2 seconds (sometimes even 2 per second) while 
network is active on 2.6.37.6. Up to the latest kernel (3.0.1) this freeze 
happens. However, 2.6.32.28 works with no problems, and it doesn't show those 
"eth0: link up" messages. I haven't tried kernels between .32 and .37.

lspci says:

13:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI 
Express Gigabit Ethernet controller (rev 03)

The solution with 2.6.37 and above: use the r8168 module from the realtek 
website. I have tested it with >30 GB at rates of 112 MB/s and experienced no 
freezes anymore.

If you need any other information or help, please let me know.

cheers,
  Michael

-- 
Sambodha: The Return of True Self-Knowledge

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