Re: Clock tracking

2021-03-22 Thread Kurt Roeckx via devel
On Mon, Mar 22, 2021 at 02:24:50PM -0700, Hal Murray via devel wrote: > > Since you mentioned PTP, can we use the PTP time stamping stuff to get better > time stamps for NTP packets? (without dragging in any/much PTP stuff) NTP can make use of some of the features that PTP hardware supports.

Re: Clock tracking

2021-03-22 Thread Gary E. Miller via devel
Yo Hal! On Mon, 22 Mar 2021 14:24:50 -0700 Hal Murray wrote: > Gary said: > > You could try PTP. The linuxptp project is active. With ethernet > > cards that support hardware time stamps you can get 1 micro second > > offsets, maybe a lot better. > > Thanks. Could you say a bit more. >

Re: Clock tracking

2021-03-22 Thread Hal Murray via devel
Gary said: > You could try PTP. The linuxptp project is active. With ethernet cards that > support hardware time stamps you can get 1 micro second offsets, maybe a lot > better. Thanks. Could you say a bit more. If I start with 4 PCs plugged into a low end 5 port switch, what else do I

Re: Clock tracking

2021-03-22 Thread Gary E. Miller via devel
Yo Hal! You could try PTP. The linuxptp project is active. With ethernet cards that support hardware time stamps you can get 1 micro second offsets, maybe a lot better. http://linuxptp.sourceforge.net/ On Mon, 22 Mar 2021 11:13:11 -0700 Hal Murray via devel wrote: > Suppose I want to

Clock tracking

2021-03-22 Thread Hal Murray via devel
Suppose I want to compare log file on several systems. Assume they are all on the same Ethernet switch. I'd like the clocks to track -- I don't care (much) how accurate they are as long as they all have the same offset/error. Has anybody worked on this area? (Is it simple enough not to