Re: [Linuxptp-users] tx poll timeout

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

On Wed, Jan 21, 2015 at 09:06:39AM +0000, Ledda William EXT wrote:
> Hello,
> Sometimes I see a "tx poll timeout" sending a delay requests. After about 20 seconds and then the synchronization restarts. What could be the root cause? It could be a problem of the driver or a problem of the network? What else?

This can be caused by:

1. link down
2. driver/stack latency delivering the time stamp
3. driver/hw dropping the time stamp

Cases 1 and 3 will always trigger the fault. If this happens too
often, you can reduce the fault duration with the configuration option
called "fault_reset_interval".

Case 2 can be mitigated by increasing the "tx_timestamp_timeout"
option. The default is 1 millisecond, and so you could try 2
milliseconds.

HTH
Richard