Re: [Linuxptp-users] ts2phc master offset value periodically spikes

[Richard C. <ric...@gm...>]

On Tue, Apr 12, 2022 at 08:22:26PM +0000, Cole Walker wrote:

> Given that I am running on a real-time system, do you think there is any chance that this could be contributing? How would I go about testing this?

A busy preempt_rt system can easily delay background work like uart
for a LONG time.

> # Something like
> tty_driver->low_latency = 1;

Unfortunately that doesn't do anything at all.

There are patches floating around that convert the tty stuff into a
proper kthread that can be given sched_fifo priority.  You'll have to
port those or do something similar yourself.

Recently there has been some talk on LKML on just this topic, namely
getting "low_latency" to actually do something again.  But I wouldn't
hold your breath.

HTH,
Richard