Re: [Linuxptp-users] clock_gettime performance using ptp hw clock

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

William,

On Fri, 2013-07-26 at 07:33 +0000, Ledda William EXT wrote:
> Ok, it's very clear. I was arrived to the same conclusion (use the phc2sys then read the system clock), but really I have a specific requirement to read the ptp clock and compare it  with the system time. For this operation I have to provide the performance. Really the easiest way is to use the phc2sys to synch the two clocks, and since it provide also the offset between them, I guess that this requirement is not so meaningful now and it should be reviewed.
> 
> Thanks to all for the help!
> 
> Reagrds
> 
> William

Keep in mind that phc2sys itself suffers from the same latency issues.
It doesn't have a problem with the latency because it assumes it will
maintain an average same latency, so it should be able to work, but you
still suffer from some latency when using phc2sys.

I just don't think it will actually cause an issue.

- Jake