Hi William et al,
I think I have resolved the issue though not sure whether it is the right way.
When I have used the option 'logMinDelayReqInterval -5' in ptp4l.conf at both
slave and master (as opposed to just at the slave), I could see that the
frequency of delay calculations has increased. Perhaps, at the slave, the
option might imply 'number of delay request packets to be sent' and at the
master, 'number of delay request packets to be processed'. Only when they
match, the ptp4l is taking the option into consideration.
Please feel free to pass your comments.
Thanking you in anticipation,
Regards,
Chandra
(c) : 0175508142
(O): 701.6412
"Knowledge speaks, Wisdom listens"
From: Chandra Mallela
Sent: Monday, March 16, 2015 6:55 PM
To: 'Ledda William EXT'; linuxptp-users@lists.sourceforge.net
Subject: RE: Port option: logMinDelayReqInterval
Hi William,
Thank you for your response.
Please note that the intended frequencies of Delay Request packets usually run
till about 512 packets per second. Thus, the minimum interval time is 1/512
seconds between packets. It means that 2^(-9). Thus, negative numbers make
sense more than positive numbers. Thus, we should be able to set these negative
numbers.
As I am end user, I have not looked at the code. I appreciate further inputs on
this.
BTW I have already used -ve numbers for logSyncInterval up to -9. Things seem
to be fine out there.
Thanking you in anticipation,
Regards,
Chandra
(c) : 0175508142
(O): 701.6412
"Knowledge speaks, Wisdom listens"
From: Ledda William EXT [mailto:william.le...@iter.org]
Sent: Monday, March 16, 2015 6:38 PM
To: Chandra Mallela;
linuxptp-users@lists.sourceforge.net<mailto:linuxptp-users@lists.sourceforge.net>
Subject: RE: Port option: logMinDelayReqInterval
I didn't check the code, but I suppose that ptp4l expects to work with positive
numbers. It is possible that if forces the value to zero otherwise.
From: Chandra Mallela [mailto:small...@altera.com]
Sent: 16 March 2015 11:22
To:
linuxptp-users@lists.sourceforge.net<mailto:linuxptp-users@lists.sourceforge.net>
Subject: [Linuxptp-users] Port option: logMinDelayReqInterval
Hi Friends,
I have had some difficulty in using the following option.
1. I have used it as follows only at slave as keeping this option at the
master does not make sense (the slave initiates these packets). In fact, I have
varied the number between -1 to -5 to check the effect of increased frequency
of pathdelay calculations (2 DelayReq packets per second to 32 DelayReq packets
per second). Please note that I have used the negative numbers to suit the
frequency to the mean interval between packets. Is the following usage correct?
[global]
logMinDelayReqInterval -5
2. However, irrespective of the of the option number between -1 and -5, I
have always got the following message.
Ptp4l[3022.814]: port 1: minimum delay request interval 2^0
What does this mean? If the message is correct, the numbers that have been used
in the above option have not been used by the ptp4l and they have been
defaulted to 0. If that is the case, how can I use the option correctly? Should
I use the above option with any other options to cause its effect on the ptp
operation?
Please clarify.
Thanking you in anticipation,
Regards,
Chandra
(c) : 0175508142
(O): 701.6412
"Knowledge speaks, Wisdom listens"
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