diff options
| author | wollman <wollman@FreeBSD.org> | 1996-01-30 18:56:47 +0000 |
|---|---|---|
| committer | wollman <wollman@FreeBSD.org> | 1996-01-30 18:56:47 +0000 |
| commit | 0f051dbe15584dfdb04ee0ce3c0f2e9164097280 (patch) | |
| tree | 3312ba08ef0790620d22873f6f6020aeee294199 /sys/i386/include/clock.h | |
| parent | 3b195d769a569c04772af6f2ca2888e3b13da1f9 (diff) | |
| download | FreeBSD-src-0f051dbe15584dfdb04ee0ce3c0f2e9164097280.zip FreeBSD-src-0f051dbe15584dfdb04ee0ce3c0f2e9164097280.tar.gz | |
No longer use the cyclecounter to attempt to correct for late or missed
clock interrupts.
Keep a 1-in-16 smoothed average of the length of each tick. If the
CPU speed is correctly diagnosed, this should give experienced users
enough information to figure out a more suitable value for `tick'.
Diffstat (limited to 'sys/i386/include/clock.h')
| -rw-r--r-- | sys/i386/include/clock.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/sys/i386/include/clock.h b/sys/i386/include/clock.h index 1f63bfe..8671311 100644 --- a/sys/i386/include/clock.h +++ b/sys/i386/include/clock.h @@ -3,7 +3,7 @@ * Garrett Wollman, September 1994. * This file is in the public domain. * - * $Id: clock.h,v 1.7 1995/12/10 13:38:07 phk Exp $ + * $Id: clock.h,v 1.8 1995/12/24 08:10:49 davidg Exp $ */ #ifndef _MACHINE_CLOCK_H_ @@ -58,6 +58,7 @@ extern int disable_rtc_set; extern unsigned i586_ctr_rate; /* fixed point */ extern long long i586_last_tick; extern long long i586_ctr_bias; +extern unsigned long i586_avg_tick; #endif extern int timer0_max_count; extern u_int timer0_overflow_threshold; @@ -72,17 +73,16 @@ static __inline u_long cpu_thisticklen(u_long dflt) { long long old; - long rv; + long len; if (i586_ctr_rate) { old = i586_last_tick; I586_CYCLECTR(i586_last_tick); - rv = ((i586_last_tick - old) << I586_CTR_RATE_SHIFT) + len = ((i586_last_tick - old) << I586_CTR_RATE_SHIFT) / i586_ctr_rate; - } else { - rv = dflt; + i586_avg_tick = i586_avg_tick * 15 / 16 + len / 16; } - return rv; + return dflt; } #endif |
