Re: b44: high ping times with wireless-dev

On Sunday 17 June 2007 14:03:30 Maximilian Engelhardt wrote:

On Sunday 17 June 2007, Michael Buesch wrote:

quoted

On Saturday 16 June 2007 23:27:43 Maximilian Engelhardt wrote:

quoted

[...]
ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 10
ACPI: PCI Interrupt 0000:02:02.0[A] -> Link [LNKD] -> GSI 10 (level, low)
-> IRQ 10
ssb: Sonics Silicon Backplane found on PCI device 0000:02:02.0
b44.c:v2.0
eth0: Broadcom 44xx/47xx 10/100BaseT Ethernet 00:c0:9f:29:99:a7
[...]

Ok, I prepared two debugging patches.

Please enable SonicsSiliconBackplane Debugging in the kernel kconfig,
so I can get more detail information about your card.
Device Drivers/Sonics Silicon Backplane/SSB debugging
(Must disable "No SSB kernel messages")

Please apply and test the attached debugging patches in a row.
So apply patch 1 and test if it works again. If not, apply
patch 2 and test if it works.
Always save complete dmesg log on each test run and send it to me.

Thanks for testing.
(This time it seems we are actually getting somewhere, when
dealing with sane people. :D )

I did the tests with my kernel where only the card is on interrupt 10. dmesg 
is attached.
With the first patch applied networking does work again. I also additionally 
tried patch2 and it also does work.

Great!
To me this seems to be a silicon bug. The IRQ routing value, which is read
from the chip here, is hardcoded in the old b44 driver.
I'll implement a workaround for this and submit a patch.

-- 
Greetings Michael.