https://bugs.dpdk.org/show_bug.cgi?id=804
Bug ID: 804
Summary: distributor: exiting workers can hang distributor core
Product: DPDK
Version: 21.08
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: examples
Assignee: dev@dpdk.org
Reporter: brian90...@gmail.com
Target Milestone: ---
Created attachment 171
--> https://bugs.dpdk.org/attachment.cgi?id=171&action=edit
patch to avoid hanging
Hello,
I have been testing the distributor example using one interface and five cores
- ./build/distributor_app -l 10-14 -- -p 1. This leaves me one worker thread. I
noticed the application often hangs after I supply SIGINT and I have to
manually kill the process.
I added some additional debugging and discovered the distributor core is not
returning from rte_distributor_flush(). Looking inside that function, I see the
loop waiting for total_outstanding() to return 0. I believe that requires all
workers to have returned all in-flight packets?
Moving to the worker core, it calls rte_distributor_get_pkt(), does its
processing, then loops to the start of the while(!quit_signal_work) block. When
exiting, this is true, so it immediately exits the loop - without returning the
last batch of packets. I believe this is what is causing the distributor core
to fail to exit as it continues to loop waiting for workers to return their
buffers.
As a test, I added a call to rte_distributor_return_pkt(d, id, buf, num)
outside the worker while() loop but before the thread exits. I've run many
tests and have not seen the process hang once.
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