topic posted interrupts in Software Archive

posted interrupts

Monica_K_Intel1 — Fri, 05 Aug 2016 17:47:20 GMT

I want to understand the working of posted interrupts , have a couple of questions:

/proc/interrupts have entries for PIN and PIW – My current set up has the a Altera FPGA card in a Virtual Machine generating 1000 interrupts, and I observe that PIN is around 25-40 on various cores. What does the PIN signify?
Can you please explain what PIN and PIW represent for?
The perf kvm event - kvm_pi_irte_update , I assume it gets updated when the VT-d assigned device inserts the driver and confirms the posting , there has to be a count for trace event. In my case kvm_pi_irte_update is always zero . Can someone explain its working ad when the counters is updated.
Is there a way to confirm that the posting occurs?

Thanks,

Monica

Hello Monica,

Quoc-Thai_L_Intel — Tue, 09 Aug 2016 15:38:19 GMT

Hello Monica,
The setup with FPGA card is new. Once I have any feedback from the experts, I will post the feedback here.
-Thai

I have not received any

Quoc-Thai_L_Intel — Fri, 14 Oct 2016 03:03:41 GMT

I have not received any response. However, I found an Altera* support forum that might want to check for your question. Here is the link: http://www.alteraforum.com/

-Thai