netdev - Re: sky2 or acpi problem ?

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Date:	Thu, 1 Feb 2007 10:07:13 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Lionel Landwerlin <landwer@...e.fr>
Cc:	netdev@...r.kernel.org
Subject: Re: sky2 or acpi problem ?

On Thu, 01 Feb 2007 18:59:55 +0100
Lionel Landwerlin <landwer@...e.fr> wrote:

> Hi,
> we already had words on lkml about this bug with sky2 driver.
> 
> I was having problems, and you told me to use the disable_msi=1
> parameter to see what happens. After a couple of hours of testing with
> heavly ethernet load, I answered you it had fixed the problem. I was
> wrong. Now, it takes much more time to crash. Most of time, I can't even
> see what happens beacause the box is completly frozen. But after several
> crashs, I only had my keyboard locked, usb unpowered, and ethernet
> interface down, I finally had the possibility see that :
> 
> Feb  1 18:35:06 cocoduo kernel: [59723.468000] NETDEV WATCHDOG: eth0: transmit time

Transmit recovery logic is screwed up, I have a better version
but working on testing it. See attachment 1

> 
> It's exactly the same error than before. What do you think of this
> trace ? Is it related to sky2 driver or acpi ? Did you add debug output
> since 2.6.19.2 (version of the kernel I'm using) that would help to fix
> that bug ? What can I do to help to fix the bug ?
> 

The problem is that some part of the transmit path (probably the
DMA engine) is getting hung.  There is a test patch to dump
tx ring (cat /proc/net/sky2/eth0). See attachment 2

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>

View attachment "sky2-tx-recover.patch" of type "text/x-patch" (2971 bytes)

View attachment "sky2-proc-debug.patch" of type "text/x-patch" (7726 bytes)