Hello, Stephen,

Good day

The issue is not caused by DPDK itself, but arises when the DPDK worker process attempts to set affinity to a cpuset that exceeds the limits set by the cgroup cpuset settings.

Original error prints are:

     PANIC in rte_eal_init():

     Cannot set affinity

     # Callstacks.

Finding the detailed reason for the failure was challenging, so I added extra print statements to help diagnose the issue.

I understand your concern about maintaining OS independence with the rte_thread functions. This change aims to provide more context when errors occur, facilitating quicker troubleshooting. I agree that this introduces more code and could be seen as platform-specific. Perhaps we could implement this conditionally, only for platforms where such detailed logging is supported and useful.

At 2024-04-24 23:50:21, "Stephen Hemminger" <stephen@networkplumber.org> wrote:

>On Tue, 23 Apr 2024 11:02:43 +0800
>Jianyue Wu <wujianyue000@163.com> wrote:
>
>> Improve the robustness of setting thread affinity in DPDK
>> by adding detailed error logging.
>
>Is this an error you saw in your application or something inside DPDK?
>
>> Changes:
>> 1. Check the return value of pthread_setaffinity_np() and log an error
>> if the call fails.
>
>Not sure this is necessary. The rte_thread functions are intended to
>be os independent wrapper for threads. Does it need to be this chatty.
>
>> 2. Include the current thread name, the intended CPU set, and a detailed
>> error message in the log.
>
>This introduces a more code and ends up being Linux/BSD specific only
>for the case where application did something wrong.