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authorRoman Zippel <zippel@linux-m68k.org>2006-10-01 08:28:28 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-01 09:39:27 +0200
commitf19923937321244e7dc334767eb4b67e0e3d5c74 (patch)
treebe82956c645bab0cb13e73677116417d4c5ce311 /security
parent[PATCH] ntp: convert time_freq to nsec value (diff)
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[PATCH] ntp: convert to the NTP4 reference model
This converts the kernel ntp model into a model which matches the nanokernel reference implementations. The previous patches already increased the resolution and precision of the computations, so that this conversion becomes quite simple. <linux@horizon.com> explains: The original NTP kernel interface was defined in units of microseconds. That's what Linux implements. As computers have gotten faster and can now split microseconds easily, a new kernel interface using nanosecond units was defined ("the nanokernel", confusing as that name is to OS hackers), and there's an STA_NANO bit in the adjtimex() status field to tell the application which units it's using. The current ntpd supports both, but Linux loses some possible timing resolution because of quantization effects, and the ntpd hackers would really like to be able to drop the backwards compatibility code. Ulrich Windl has been maintaining a patch set to do the conversion for years, but it's hard to keep in sync. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Cc: john stultz <johnstul@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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