[OmniOS-discuss] [discuss] Re: [networking] rge_intr troubles

[Saso Kiselkov]

On 10/1/16 11:45 PM, Dale Ghent wrote:
> 
>> On Oct 1, 2016, at 3:36 PM, Saso Kiselkov <skiselkov.ml at gmail.com> wrote:
>>
>> So I'm playing around with a box that has an on-board Realtek NIC and
>> periodically, about once every 2-5 minutes, the network just goes out to
>> lunch and stops responding to ping or attempts to send anything from
>> the box. I noticed that while doing so, the box is getting floored by
>> interrupts from the NIC, so I see tons of rge_intr activity and one CPU
>> core receiving about 160000 interrupts per second (other cores are idle).
> 
> One core getting all the interrupts is expected, as both these chips and the driver do not support RSS.
> 
> The key thing here is to see what rge_intr() is actually doing. It has 2 outcomes: It identifies the interrupt type, processes it, then returns to the DDI that it was claimed. IF it doesn't identify the interrupt, rge_intr() returns and reports unclaimed to the DDI.
> 
> Knowing this info would be a good first step in figuring out what's going on.

Every time, we're returning through the bottom of the function,
returning DDI_INTR_CLAIMED. So the interrupt is meant for us.

-- 
Saso