[dpdk-dev] [RFC v2] eal: simplify the implementation of rte_ctrl_thread_create

[Mattias Rönnblom]

On 2021-08-25 17:31, Honnappa Nagarahalli wrote:
> <snip>
> 
>>
>> On 2021-08-24 23:30, Stephen Hemminger wrote:
>>> On Tue, 24 Aug 2021 20:03:03 +0000
>>> Honnappa Nagarahalli <Honnappa.Nagarahalli at arm.com> wrote:
>>>
>>>>> One difference between this implementation and the previous one is
>>>>> this busy loop. rte_pause() relaxes the cpu, but will not make the
>>>>> calling thread to sleep and wait for the sync event. So here we can
>>>>> spin a quite long time until the other thread is scheduled by the OS.
>>>> Yes, this is a difference. We could add a microsleep to allow for the OS to
>> un-schedule the current thread.
>>>
>>> Why not use sched_yield() here?
>>>
>>
>> The man page is not exactly encouraging the use sched_yield on CFS.
> Sorry, what is CFS?
> There are already several uses of sched_yield in the code.
> 

CFS is the Linux best-effort scheduler and default scheduling policy, 
and likely used by most DPDK applications.