Re: [Linuxptp-users] tx poll timeout

[Ledda W. E. <Wil...@it...>]

Thank you Richard, 
I'll investigate further in this sense tuning the parameters.

William


William LEDDA
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-----Original Message-----
From: Richard Cochran [mailto:ric...@gm...] 
Sent: 21 January 2015 11:31
To: Ledda William EXT
Cc: lin...@li...
Subject: Re: [Linuxptp-users] tx poll timeout

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