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Date: Mon, 09 Feb 2009 11:13:57 -0800
From: Yinghai Lu <yinghai@kernel.org>
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To: Ingo Molnar <mingo@elte.hu>
CC: Jeff Garzik <jeff@garzik.org>, Andrew Morton <akpm@linux-foundation.org>,
       Ayaz Abdulla <aabdulla@nvidia.com>,
       "David S. Miller" <davem@davemloft.net>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       NetDev <netdev@vger.kernel.org>
Subject: Re: [PATCH] forcedeth: make msi-x different name for rx-tx
References: <498BC3A8.9040203@kernel.org> <20090206144948.GD18368@elte.hu> <498C6C15.3050807@kernel.org> <20090206171544.GA16190@elte.hu> <498C7958.4010109@kernel.org> <20090209120057.GB17782@elte.hu>
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Ingo Molnar wrote:
> * Yinghai Lu <yinghai@kernel.org> wrote:
> 
>> Ingo Molnar wrote:
>>> * Yinghai Lu <yinghai@kernel.org> wrote:
>>>
>>>> Ingo Molnar wrote:
>>>>> Cool cleanups!
>>>>>
>>>>> Would you mind to also fix the following - on all my systems that have 
>>>>> forcedeth gigabit ethernet i've been getting these bogus warnings for 
>>>>> _years_, under moderate load:
>>>>>
>>>>>   eth2: too many iterations (16) in nv_nic_irq.
>>>>>
>>>>> I think a 64 iterations limit will work much better. (i tried a limit of 50 
>>>>> a year ago for a while and it worked fine and had no side effects - and the 
>>>>> bogus warnings were done.)
>>>> you may enable CONFIG_FORCEDETH_NAPI.
>>>>
>>>> we should enable NAPI for forcedeth by default, and try to squash more bugs out.
>>> i do have that:
>>>
>>>  CONFIG_FORCEDETH=y
>>>  CONFIG_FORCEDETH_NAPI=y
>>>
>>> and the messages still come.
>> so you systems are using ioapic routing, or msi.
>>
>> and those messages are from 
>> nv_nic_irq_optimized or nv_nic_irq
>> for TX or OTHER (timerirq).
> 
> yes, IO-APIC:
> 
>  18:      81386  306713817          0          0 1413724087          0          0          
> 0          0          0          0          0          0          0          0          
> 0   IO-APIC-fasteoi   eth2
> 
> Those messages do come and are annoying.

it seems timerirq by nic cause extra irq...
need to figure out why all devices need that workaround..., checked ck804 and mcp55 doesn't need it.

YH