>>> The basic idea is to do the time stamping in hardware deep in >>> the network adaper. That avoids lots and lots of jitter. > >>Yes, PTP can yield an accuracy better than 100 ns if both the NICs at the >>clients and the server support hardware timestamping of sent/received PTP >>packets. > >I am still confused. To timestamp you have to read the computer's clock. >That is a software operation-- reading the counter in the cpu, translating >to time, returning the result through the kernel, etc. That has all kinds >of variable latencies,etc. I am having trouble seeing 100ns. Also seeing >the PPS from the hardware clock and its interrupts. Or are you replacing >all of the hardware and software of the system? (new kernel, new interrupt >system, new nics, etc)
You can build a clock into the network adapter and sync it up to the system clock. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
