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authorAlexander Gordeev <lasaine@lvk.cs.msu.su>2011-01-12 17:00:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 08:03:20 -0800
commit025b40abe715d638e60516a657d354e8560c1a85 (patch)
tree9320d3993c65c4eb56d3ab30337d590eb8c892fd /kernel/lockdep_proc.c
parent12f9b1f9c11700893a7b453705d95b260d78f268 (diff)
ntp: add hardpps implementation
This commit adds hardpps() implementation based upon the original one from the NTPv4 reference kernel code from David Mills. However, it is highly optimized towards very fast syncronization and maximum stickness to PPS signal. The typical error is less then a microsecond. To make it sync faster I had to throw away exponential phase filter so that the full phase offset is corrected immediately. Then I also had to throw away median phase filter because it gives a bigger error itself if used without exponential filter. Maybe we will find an appropriate filtering scheme in the future but it's not necessary if the signal quality is ok. Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su> Acked-by: John Stultz <johnstul@us.ibm.com> Cc: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/lockdep_proc.c')
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