Dear all:
I am developing a vpp client built with govpp by using “AsyncConnect”
function. The first time I run the client before or after vpp, everything is
ok. After I restart vpp while keeping the client running, the CPU usage of the
client becomes high to around 70%.
I have found the problem and solved it. I didn’t find any Jira ticket
entry, so I posted here and I hope the developers would solve it in next
release. Thanks.
I used “top -H” and gdb to find the high cpu usage thread which is
“vac_timeout_thread_fn” in file “src/vpp-api/client/client.c”. The first time
it blocked in “pthread_cond_wait”, which won’t take cpu.
but in second time, it runs the loop all the time because
“timeout_in_progress” becomes true and “read_timeout” is still zero, which make
“pthread_cond_timedwait” always returns.
I found the problem is in “vac_disconnect” , it calls “set_timeout(0)”,
which will make the issue above happend.
In fact, “vac_disconnect” should call “unset_timeout()” to make thread
quit gracefully and keep the global variables connect.
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