Re: [Linuxptp-users] Configuration for boundary clock with on two-port NIC

[Nils F. <nil...@sr...>]

Thanks for the quick answer!

I have a 82599ES from Intel [1]. I found the paramters you were 
referring to but I am not sure how to adjust them. Can you give me some 
guidance for this if you get a chance?

These are my current settings, basically the default.cfg:

pi_proportional_const   0.0
pi_integral_const       0.0
pi_proportional_scale   0.0
pi_proportional_exponent        -0.3
pi_proportional_norm_max        0.7
pi_integral_scale       0.0
pi_integral_exponent    0.4
pi_integral_norm_max    0.3

Thanks for the help!

Best regards

Nils


[1] 
https://www.intel.la/content/www/xl/es/products/sku/41282/intel-82599es-10-gigabit-ethernet-controller/specifications.html 


On 2/10/23 11:12, Miroslav Lichvar wrote:
> On Mon, Oct 02, 2023 at 09:44:19AM +0200, Nils Fuerste wrote:
>> Unfortunately, the sync on the server receiving the sync from the BC looks
>> like this:
>>
>> ptp4l[3297.441]: master offset         42 s2 freq   +9338 path delay
>> 319
>> ptp4l[3298.441]: master offset        -10 s2 freq   +9298 path delay
>> 319
>> ptp4l[3299.441]: master offset         19 s2 freq   +9324 path delay
>> 319
> That doesn't look too bad.
>
>> Is there a way to improve the configuration? I found the boundary_clock_jbod
>> parameter but setting it to 1 didn't improve the sync.
> jbod is only needed when the ports don't share the same clock. It
> degrades the sync quality.
>
>> Can someone provide a
>> configuration for a simple BC setup with one two-port NIC? What is the sync
>> quality I can expect? Any help is appreciated! Thanks in advance!
> It depends on the hardware. What NIC do you have?
>
> One thing you can try is to shorten the sync interval and decrease the
> PI constants, also on the client's port of the server to minimize the
> frequency noise transferred to the client.
>