Rune Magnussen wrote: > Spoon wrote: > >> I had randomly thought it might be a good idea to crank HZ up to 250. >> Are you saying ntpd will break if I set HZ to 250 in Linux 2.6? > > The (PPS?) kernel discipline only works with 100 HZ. That is a kernel > issue. I am using 250 HZ on my ntp client PC and it works fine. If the > clock lags behind and ntpd cannot correct that then there is a problem and > it could be lost interrupts. With high HZ-values like 1000 lost interrupts > are more likely.
I am confused. kernel/time/ntp.c defines int do_adjtimex(struct timex *txc) which contains the following comment: /* PPS is not implemented, so these are zero */ http://lxr.linux.no/source/kernel/time/ntp.c#L193 On a related note, there seems to be an effort to make the NTP kernel code independent of HZ. http://lkml.org/lkml/2006/12/12/236 Regards. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
