Messages in this thread Patch in this message | | | Subject | [PATCH SET - 3/3] linux-2.5.73_lost-tick-corner-fix_A0 | From | john stultz <> | Date | 30 Jun 2003 15:26:23 -0700 |
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This patch catches a corner case in the lost-tick compensation code. There is a check to see if we overflowed between reads of the two time sources, however should the high res time source be slightly slower then what we calibrated, its possible to trigger this code when no ticks have been lost. This patch adds an extra check to insure we have seen more then one tick before we check for this overflow. This seems to resolve the remaining "time doubling" issues that I've seen reported. This patch applies ontop of lost-tick-speedstep-fix_A1.
Please consider for inclusion in your tree.
thanks -john
timer_cyclone.c | 2 +- timer_tsc.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff -Nru a/arch/i386/kernel/timers/timer_cyclone.c b/arch/i386/kernel/timers/timer_cyclone.c --- a/arch/i386/kernel/timers/timer_cyclone.c Mon Jun 30 13:53:56 2003 +++ b/arch/i386/kernel/timers/timer_cyclone.c Mon Jun 30 13:53:56 2003 @@ -88,7 +88,7 @@ * between cyclone and pit reads (as noted when * usec delta is > 90% # of usecs/tick) */ - if (abs(delay - delay_at_last_interrupt) > (900000/HZ)) + if (lost && abs(delay - delay_at_last_interrupt) > (900000/HZ)) jiffies++; } diff -Nru a/arch/i386/kernel/timers/timer_tsc.c b/arch/i386/kernel/timers/timer_tsc.c --- a/arch/i386/kernel/timers/timer_tsc.c Mon Jun 30 13:53:56 2003 +++ b/arch/i386/kernel/timers/timer_tsc.c Mon Jun 30 13:53:56 2003 @@ -205,7 +205,7 @@ * between tsc and pit reads (as noted when * usec delta is > 90% # of usecs/tick) */ - if (abs(delay - delay_at_last_interrupt) > (900000/HZ)) + if (lost && abs(delay - delay_at_last_interrupt) > (900000/HZ)) jiffies++; }
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