Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

On 12/17/2011 12:57 PM, David Malone wrote: Dave Hart writes: I did a bit of searching but of course this is an odd request: "help me degrade the precision of my system clock, please" hasn't come up much. If you have any suggestions, please speak up here, or privately if you prefer. On Fre

Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

Miroslav Lichvar wrote: Why not degrade the resolution of the clock directly in ntp sources? Good idea. In get_systime(): GET_SYSTIME_AS_TIMESPEC(&ts); ts.tv_nsec /= 100; ts.tv_nsec *= 100; Ouch! I'd far prefer a simple mask, getting rid of the bottom N bit

Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

Dave Hart writes: >I did a bit of searching but of course this is an odd request: "help >me degrade the precision of my system clock, please" hasn't come up >much. If you have any suggestions, please speak up here, or privately >if you prefer. On FreeBSD you could try selecting the "dummy" tim

Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

E-Mail Sent to this address will be added to the BlackLists wrote: Dave Hart wrote: Linux might be reconfigured to use a more primitive clock that steps once per millisecond or less. Linux Kernel 2.4 used 100 Hz and 2.6 increased it to 1000 Hz? They still read the time to the full CTC resolu

Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

On Thu, Dec 15, 2011 at 07:50:08PM +, Dave Hart wrote: > Dr. Mills raised the possibility privately that either FreeBSD or > Linux might be reconfigured to use a more primitive clock that steps > once per millisecond or less. If possible and I am able to accomplish > it, my testing of these bu

Re: [ntp:questions] Configure FreeBSD or Linux to use stepping clock?

Dave Hart wrote: > Linux might be reconfigured to use a more primitive clock that steps > once per millisecond or less. Linux Kernel 2.4 used 100 Hz and 2.6 increased it to 1000 Hz? Seems like related research / testing -- E-

[ntp:questions] Configure FreeBSD or Linux to use stepping clock?

I have some pending changes to improve the way ntpd fuzzes the insignificant bits of times it reads from the OS clock what that OS clock ticks slowly enough that it is possible for ntpd to read the same current time in subsequent gettimeofday()getclock() calls. See http://bugs.ntp.org/2037. While