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Date: Fri, 02 Feb 2007 09:25:38 -0800
From: Auke Kok <auke-jan.h.kok@...el.com>
To: Adrian Bunk <bunk@...sta.de>
CC: Adam Kropelin <akropel1@...hester.rr.com>,
linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org
Subject: Re: MSI failure on nForce 430 (WAS: intel 82571EB gigabit fails to
see link on 2.6.20-rc5 in-tree e1000 driver (regression))
Adrian Bunk wrote:
> On Sat, Jan 20, 2007 at 02:34:37PM -0500, Adam Kropelin wrote:
>> (cc: list trimmed and thread moved to linux-pci)
>>
>> I have a PCI-E e1000 card that does not see interrupts on 2.6.20-rc5
>> unless CONFIG_PCI_MSI is disabled. An e1000 maintainer indicated that
>> the PHY state is correct, it's just that the interrupt is not getting
>> thru to the kernel. Interestingly, on 2.6.19 PHY interrupts get thru ok
>> with MSI enabled (link status responds appropriately) but packet tx
>> fails with timeout errors, implying that perhaps MAC interrupts are not
>> arriving.
>>
>> I've attached the contents dmesg, 'lspci -vvv', and 'cat
>> /proc/interrupts' from 2.6.20-rc5.
>>
>> This is an nForce 430 based chipset on a Dell E521 which has had
>> interrupt routing issues before. Prior to 2.6.19 it had to be booted
>> with 'noapic' in order to come up at all. It also had USB lockup
>> problems until I applied the latest BIOS update (v1.1.4). So a BIOS
>> interrupt routing bug with MSI is not out of the question.
>>
>> I'm happy to gather more data or run tests...
>
> Was this regression fixed by Eric's patch that is included in -rc7?
no, this is a different issue afaics. Eric's patch solves a msi vector leak
where MSI's were no longer recovered after all 256 of them were handed out. The
issue here seems to be a very different regression (no vector at all or vector
not setup correctly to begin with).
I do suggest re-testing the issue with 2.6.20rc7, but it's unlikely it fixes the
problem for Adam.
The same issue was reported 2/3 days ago by another user basically too (no
interrupts at all arriving with MSI enabled).
Cheers,
Auke
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