[ntp:questions] like a kid with a new toy (PPS jitter)
"terje.mathisen at tmsw.no" at ntp.org
Fri Feb 6 07:21:19 UTC 2009
p.kennedy at fugro.com.au wrote:
> On Feb 6, 7:23 am, Dave Hart <daveh... at gmail.com> wrote:
>> It's running with a patch to lock the main and timer threads to the
>> 2nd CPU using SetThreadAffinity. I haven't tried locking the async I/
>> O thread as well, but I will now. It's also running with a patch to
>> the interpolation code which is more selective about baseline counter/
>> time pairs it uses. There is a faster server on the same LAN I could
>> try as well, but I figured slower is better for understanding how bad
>> the user-mode PPS implementation is.
>> Dave Hart
> Under windows OS, I believe working in the 10's of microsecod range is
> pretty good, and a darn site better than flat NMEA. Terje, can you
> let me know what is bad about this?
Oh, it is indeed _very_ good!
When I wrote my reply I simply didn't consider getting such good results
under Windows, i.e. I assumed FreeBSD or Linux.
Dave: You're doing great!
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"
More information about the questions