Re: [Linuxptp-users] Loss of sync with 25% of CPU load

[Diego G. P. <gpr...@un...>]

Hello,

It does not work. Done: stress-ng (fifo 50), ptp4l (fifo 99), 
phc2sys(fifo 99), kworker of the cores where ptp4l and phc2sys run (fifo 
99). it still breaks the ptp4l synchronization when stress-ng boots up. 
I do not believe that it has not happend to others.

Some new advice?


Thank you for reading,

Diego

El 07/04/2021 a las 17:04, Richard Cochran escribió:
> On Wed, Apr 07, 2021 at 11:38:55AM +0200, Diego García Prieto wrote:
>
>> I would like to know if I can stablish somehow a deadline to the ptp4l
>> protocol to avoid other threads run before it. I think that whereby I can
>> avoid the loss of syncronization. What do you think with respect to it?
> IOW, give it higher sched_fifo priority than stress-ng.
>
> Also, depending on your network load, watch out for stress-ng starving
> the networking stack (by keeping ksoftirqd from running).
>
> Also, watch out for stress-ng starving kworker threads (if your MAC
> driver uses kwork to deliver Tx time stamps).
>
> HTH,
> Richard