netdev - Re: Realtek 8111C transmit timed out

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Date:	Mon, 4 Aug 2008 20:00:15 -0600
From:	"John P Poet" <jppoet@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: Realtek 8111C transmit timed out

On Mon, Aug 4, 2008 at 7:12 PM, John P Poet <jppoet@...il.com> wrote:
> I recently bought a new motherboard with Realtek 8111C nics.  The nic
> is detected as:
>
> dmesg:
> r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded
> ACPI: PCI Interrupt 0000:06:00.0[A] -> GSI 18 (level, low) -> IRQ 18
> PCI: Setting latency timer of device 0000:06:00.0 to 64
> eth0: RTL8168c/8111c at 0xffffc2000063e000, 00:1f:d0:20:01:57, XID
> 3c4000c0 IRQ 2292
>
> lspci -v:
> 06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
>        Subsystem: Giga-byte Technology Unknown device e000
>        Flags: bus master, fast devsel, latency 0, IRQ 2292
>        I/O ports at b000 [size=256]
>        Memory at de010000 (64-bit, prefetchable) [size=4K]
>        Memory at de000000 (64-bit, prefetchable) [size=64K]
>        [virtual] Expansion ROM at de020000 [disabled] [size=64K]
>        Capabilities: [40] Power Management version 3
>        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit+
> Queue=0/1 Enable+
>        Capabilities: [70] Express Endpoint, MSI 01
>        Capabilities: [b0] MSI-X: Enable- Mask- TabSize=2
>        Capabilities: [d0] Vital Product Data <?>
>        Capabilities: [100] Advanced Error Reporting <?>
>        Capabilities: [140] Virtual Channel <?>
>        Capabilities: [160] Device Serial Number 78-56-34-12-78-56-34-12
>        Kernel driver in use: r8169
>        Kernel modules: r8169
>
> I have been having two problems with this nic:
>
> 1) On a cold boot, the nic is not brought up correctly.  It seems to
> stay at 100mbit instead of going into gbit mode, and it fails to ping
> the router even though it seems to get a valid IP address.  If I then
> warm boot the computer, then then nic comes up in gbit just fine, and
> generally works.
>
> 2) I am getting a lot of timeouts:
>
> Aug  4 17:49:35 saphire kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Aug  4 17:49:35 saphire kernel: r8169: eth0: link up
> Aug  4 17:50:05 saphire kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Aug  4 17:50:05 saphire kernel: r8169: eth0: link up
> ...
> Aug  4 18:52:17 saphire kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Aug  4 18:52:17 saphire kernel: r8169: eth0: link up
> ...
> Aug  4 18:55:59 saphire kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Aug  4 18:55:59 saphire kernel: r8169: eth0: link up
> ...
> Aug  4 18:57:47 saphire kernel: NETDEV WATCHDOG: eth0: transmit timed out
> Aug  4 18:57:47 saphire kernel: r8169: eth0: link up
>
> While the booting problem is annoying, the timeouts are actually even
> more so.  I am a mythtv users, and those timeouts cause my video/audio
> streaming to fail.
>
> Is there anything I can do about these problems?

I probably should have mentioned that I am running the 2.6.26 kernel.

John
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