Re: [Linuxptp-users] Hardware PTP clock synchronization

[Keller, J. E <jac...@in...>]

> -----Original Message-----
> From: Гаврилов Александр [mailto:le...@im...]
> Sent: Sunday, August 04, 2013 11:56 PM
> To: lin...@li...
> Subject: Re: [Linuxptp-users] Hardware PTP clock synchronization
> 
> Hello!
> 
> Here is an example of the log where synchronization occured:
> 
> -----------------------------------------------------------------------
> 
> ptp4l -2 -i p16p1 -m -H -s
> ptp4l[17534.938]: selected /dev/ptp0 as PTP clock
> ptp4l[17534.957]: port 1: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[17534.957]: port 0: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[17536.761]: port 1: new foreign master ece555.fffe.2de639-2
> ptp4l[17540.751]: selected best master clock ece555.fffe.2de639
> ptp4l[17540.751]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
> ptp4l[17542.696]: port 1: minimum delay request interval 2^3
> ptp4l[17542.746]: master offset 50001478246023551 s0 adj      +0 path
> delay       1276
> ptp4l[17543.744]: master offset 50001478246021573 s0 adj      +0 path
> delay        974
> ptp4l[17544.741]: master offset 50001478246019277 s0 adj      +0 path
> delay        974
> ptp4l[17545.739]: master offset 50001478246016997 s1 adj      +0 path
> delay        974
> ptp4l[17546.736]: master offset      -5048 s2 adj   -5048 path delay
> 974
> ptp4l[17546.736]: port 1: UNCALIBRATED to SLAVE on
> MASTER_CLOCK_SELECTED
> ptp4l[17547.734]: master offset      -2323 s2 adj   -3837 path delay
> 974
> ptp4l[17548.732]: master offset       -789 s2 adj   -3000 path delay        974
> ptp4l[17549.729]: master offset        -95 s2 adj   -2543 path delay        974
> ptp4l[17550.726]: master offset        123 s2 adj   -2354 path delay        974
> ptp4l[17551.724]: master offset        110 s2 adj   -2330 path delay        974
> ptp4l[17552.721]: master offset        106 s2 adj   -2301 path delay        974
> ptp4l[17553.719]: master offset        109 s2 adj   -2266 path delay        974
> ptp4l[17554.716]: master offset        104 s2 adj   -2238 path delay        974
> ptp4l[17555.714]: master offset        -27 s2 adj   -2338 path delay        974
> ptp4l[17556.711]: master offset        -48 s2 adj   -2367 path delay        974
> ptp4l[17557.709]: master offset        -53 s2 adj   -2386 path delay        974
> ptp4l[17558.706]: master offset         45 s2 adj   -2304 path delay        974
> ptp4l[17559.704]: master offset        275 s2 adj   -2061 path delay        716
> ptp4l[17560.701]: master offset          9 s2 adj   -2244 path delay        716
> ptp4l[17561.699]: master offset       -131 s2 adj   -2382 path delay        716
> ptp4l[17562.696]: master offset       -176 s2 adj   -2466 path delay        716
> ptp4l[17563.694]: master offset       -102 s2 adj   -2445 path delay        716
> ptp4l[17564.691]: master offset        -28 s2 adj   -2401 path delay        716
> ptp4l[17565.689]: master offset         47 s2 adj   -2335 path delay        716
> ptp4l[17566.686]: master offset          2 s2 adj   -2366 path delay        716
> ptp4l[17567.684]: master offset        -27 s2 adj   -2394 path delay        716
> ptp4l[17568.681]: master offset         40 s2 adj   -2335 path delay        716
> ptp4l[17569.679]: master offset        -13 s2 adj   -2376 path delay        716
> ptp4l[17570.676]: master offset         69 s2 adj   -2298 path delay        589
> ptp4l[17571.674]: master offset          9 s2 adj   -2337 path delay        589
> ptp4l[17572.671]: master offset        -52 s2 adj   -2396 path delay        589
> ptp4l[17572.955]: recvmsg tx timestamp failed: Resource temporarily
> unavailable
> ptp4l[17572.955]: port 1: send delay request failed
> ptp4l[17572.955]: port 1: SLAVE to FAULTY on FAULT_DETECTED
> ptp4l[17591.068]: port 1: FAULTY to LISTENING on FAULT_CLEARED
> ptp4l[17592.622]: port 1: new foreign master ece555.fffe.2de639-2
> ptp4l[17596.612]: selected best master clock ece555.fffe.2de639
> ptp4l[17596.612]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
> ptp4l[17597.609]: master offset       1492 s2 adj    -867 path delay        589
> ptp4l[17597.609]: port 1: UNCALIBRATED to SLAVE on
> MASTER_CLOCK_SELECTED
> ptp4l[17597.654]: recvmsg tx timestamp failed: Resource temporarily
> unavailable
> ptp4l[17597.654]: port 1: send delay request failed
> ptp4l[17597.654]: port 1: SLAVE to FAULTY on FAULT_DETECTED
> 
> -----------------------------------------------------------------------
> 
> I350-F2    -    can    you    recommend    this    ethernet    adapter
> as alternative? (gigabit, fiber optic interface)
> 

It still appears to be running version 1.0. Could you please ensure you have updated to v1.2 or v1.3 and try again?

In regards to "hardware bugs"... the 82576 is not "bugged" or "glitched" so much as it is simply flawed. It has a design bug or flaw, but it is doing exactly what it was designed to do.

However, I believe you really need to update to ptp4l v1.2 since this has resolved a rather important issue around polling for Tx timestamps, and vastly reduces issues with software dropping Tx timestamps because it couldn't process them fast enough.

In addition it may be the case that you need to update your kernel. I don't recall any specific fixes for this type of issue but it is possible.

And yes, I would highly suggest posting on the e1000-devel list, because that would get proper recognition from among other folks at Intel..

While Intel's Ethernet products are validated and certified.. I don't believe much 1588/PTP testing and certification is done, especially on older hardware.

- Jake