Re: [Linuxptp-users] Some general questions.

[Richard C. <ric...@gm...>]

On Thu, Aug 30, 2018 at 12:59:12AM +0200, TheMazzim M wrote:
> BUT, if I look at the kernel config file for 4.2.0-27-generic Ubuntu 14.04
> kernel, I discover that:
> 
> # CONFIG_NETWORK_PHY_TIMESTAMPING is not set
> 
> Question:  Why is this not consistent with what ethtool reports?? Or are
> these actually independent system requirement checks??? The other kernel
> requirements are included as modules (CONFIG_PPS, PTP_1588).

This option is only needed if you have a PHY that does time stamping
(like the TI Phyter), but it adds overhead in the NW hot path.  So it
is normally disabled.

HTH,
Richard