D-Link DGE-550SX (dl2k): WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0xda/0x12d()

[Roger Heflin]

Frantisek Hanzlik wrote:
> Hello,
> we just upgraded our old router (Fedora Core 5 on AlphaServer 800, 
> kernel 2.6.17)
> to new Fedora 10/2.6.27.5-117.fc10.i686 kernel on Core2Duo i686.
> 
> PCI-X Fiber 1000BASE-SX D-Link Network Adapter DGE-550SX, which worked 
> fine in
> old Alphaserver, freeze on new machine few minutes after start (What is 
> interesting,
> in one case after it sent exactly 8192 packets, an other cases are some 
> multiples
> of 8 too) and stop transmit packets. Only workaround (but for a while) 
> is rmmod
> + modprobe its dl2k driver.

I would go post this to the kernel list, is is definitely some sort of
kernel interaction.   From what I understand the sch_generic.c error means that 
the networking driver has an issue with its hardware.

I don't believe there is a way to misconfigure things and get this.

On other network chipsets others have attempted to work around this sort of 
issue by changing how the network chipset works (turning on/off tcp offload, or 
other internal network chipset capabilities, and/or turning off pause-things can 
be adjusted with ethtool).   If you get the correct feature turned off that is 
required to trigger the bug then it may work.

Keep in mind though that typically when you have a 32bit/33Mhz network card it 
appears that the speed is limited to around 50MB/second each way, even though 
the PCI bandwidth should be high enough to do more.....I don't know why this is, 
but I have seen it with several different ethernet chipsets (tg3/e1000).