linux

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History

Miroslav Lichvar 8af3c153ba ntp: Clamp PLL update interval

Clamp update interval to reduce PLL gain with low sampling rate (e.g.
intermittent network connection) to avoid instability.

The clamp roughly corresponds to the loop time constant, it's 8 * poll
interval for SHIFT_PLL 2 and 32 * poll interval for SHIFT_PLL 4. This
gives good results without affecting the gain in normal conditions where
ntpd skips only up to seven consecutive samples.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: john stultz <johnstul@us.ibm.com>
LKML-Reference: <1283870626-9472-1-git-send-email-mlichvar@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2010-09-09 20:48:37 +02:00

clockevents.c

clockevent: Don't remove broadcast device when cpu is dead

2010-01-18 14:44:50 +01:00

clocksource.c

clocksource: Add __clocksource_updatefreq_hz/khz methods

2010-07-27 12:40:55 +02:00

jiffies.c

clocksource: Cleanup clocksource selection

2009-08-15 10:55:46 +02:00

Kconfig

time: Kill off CONFIG_GENERIC_TIME