Re: [Linuxptp-users] Two Delay_req message

[Dennis H. (dehagart) <deh...@ci...>]

Hi,

Then probably the first question would be - is this unicast or multicast? Or using a particular profile?

Regards
Dennis

-----Original Message-----
From: Miroslav Lichvar <mli...@re...> 
Sent: Monday, September 5, 2022 11:10
To: Dennis Hagarty (dehagart) <deh...@ci...>
Cc: art...@gm...; lin...@li...
Subject: Re: [Linuxptp-users] Two Delay_req message

On Mon, Sep 05, 2022 at 08:11:48AM +0000, Dennis Hagarty (dehagart) via Linuxptp-users wrote:
> In IEEE 1588-2019, the requirement for regular messages is outlined in “9.5.11.2 Timing requirements” – generally they should be transmitted at an interval above 90% of the desired inter-message interval.
> So, for example, if you configured 32 packets per second (1/32 second interval), you would expect an average inter-message time value around that configured value (roughly +/- 10%)
> So, if the two delay_Req and sent are on top of each other, then the slave is misbehaving, although the master should tolerate short excursions from the inter-message interval.

No, the client is fine. The minimum interval between two delay
requests is 0. Quoting from 9.5.11.2:

	the random distribution shall be a uniform random distribution with a
	minimum value of 0 and a maximum value of {2^logMinDelayReqInterval+1}
	seconds

-- 
Miroslav Lichvar