Hi!

Marcus Better wrote:

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(For those haven't followed, this is about
 http://permalink.gmane.org/gmane.linux.network/38493
)

Francois Romieu wrote:
 

quoted

Marcus Better [off-list ref] :
   

quoted

I'm seeing this problem on my Acer Travelmate 223X laptop with built-in
Realtek 8139: The ethernet stops working, usually after at most a few
minutes operation.
     

quoted

In a better world, you would narrow the suspect with a git bissect [1]
between v2.6.15 and v2.6.16.
   

I did, and the winner after 13 reboots is...

commit de227f5f32775d86e5c780a7cffdd2e08574f7fb
Author: Dave Airlie <airlied@starflyer.(none)>
Date:   Wed Jan 25 15:31:43 2006 +1100

   drm: i915 patches from Tungsten Graphics

   Fix CMDBUFFER path, add heap destroy and flesh out sarea for rotation
   (Tungsten Graphics)

   From: Alan Hourihane [off-list ref]
   Signed-off-by: Dave Airlie [off-list ref]


I didn't believe it at first either, but blacklisting the i915 module
actually fixes the problem. Now that I know what to look for, I notice
that the network errors always started cropping up after X11 started.

Wonder what's going on here. Why is the graphics driver killing my network?
 

I guess you got the wrong commit, and the correct one should be the one 
where Dave adds vblank interrupts. It should be close to the one you listed.

Some i915 chips have buggy interrupts. What happens is that the display 
interrupts are duplicated on the sound interrupt channel. Usually 
there's no interrupt handler there that recognizes them, and after a 
while, the kernel detects too many spurious interrupts and disables the 
sound IRQ line. If the network sits on the same IRQ line, it will be 
disabled as well. If you check your kernel logs, you will probably have 
messages about disabled IRQs.

A workaround is to add the "noirqdebug" (I hope I remember the spelling 
correctly) kernel option at boot time.

/Thomas

Marcus
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