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SubjectRe: [Openipmi-developer] modprobe ipmi_si hangs under 2.6.30-rc5
Ferenc Wagner wrote:
> Corey Minyard <minyard@acm.org> writes:
>
>
>> I know what is happening now. Can you try the attached patch? I'm
>> disabling the requeue and discarding the message when an IPMB message
>> is received before everything is initialized. If you don't, the code
>> will not deliver any messages because something is already in the
>> queue.
>>
>
> Yep, that fixed it, modprobe runs through now!
>
Thanks for testing this.

>
>> Ferenc Wagner wrote:
>>
>>
>>> My concern is that it does something too often, not letting the CPU
>>> enter deep sleep states, perhaps. Or is that also an artifact of
>>> debugging?
>>>
>> No, it's an artifact of a lousy hardware interface. Very few IPMI
>> interfaces support interrupts, so they have to be polled :(.
>>
>
> I'd say this isn't an artifact but the sad truth itself. Just out of
> interest, how often does the driver wake up to check the inteface?
>
I'd have to agree.

When idle, the driver wakes up every 10ms to check for something on the
driver. When a message is in transit, it's every jiffie.

-corey


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