On Wed, Feb 21, 2018 at 04:26:06PM +0100, Oliver Westermann wrote:
> This work queue is handled by the phy_change() function (in phy.c), which
> in a subfunction retrieves the timestamp from the phy (this is the
> add_event call from the trace above). This is delayed by 4ms.
That code in phy.c is for the phy state machine. It is not time
critical, and so using a work item is appropriate.
However your packet time stamps *are* time critical. I wouldn't put
the time stamp code there. You can't really increase the scheduling
priority of work queues.
We have a ready made kworker in ptp_clock.c.
ptp->kworker = kthread_create_worker(0, worker_name ?
worker_name : info->name);
You can use that, and then set the priority of the kthread using chrt.
HTH,
Richard
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