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1  Move the debug.clock_adjust_* sysctls to debug.clock.adjust_* to
   make it easier to get only the clock statistics.
2  Make the sysctls read-only [suggested by Marius].
3  When determining the new clock adjustment, we checked for an error
   either larger than 12.5% or smaller than 12.5%. We left out an error
   of exactly 12.5%. For errors larger than 12.5% we adjust the clock
   reload value in such a way that the next clock interrupt would be
   early (as in premature). For errors less than 12.5% we stopped the
   adjustment.
   The current algorithm doesn't benefit from excluding an error of
   exactly 12.5%. Change the code to stop adjusting the clock if the
   error is *not* larger than 12.5% [suggested by Marius].

Discussed with: marius@
This commit is contained in:
Marcel Moolenaar 2005-04-12 18:50:57 +00:00
parent 8ca623d734
commit a08d773359
1 changed files with 7 additions and 5 deletions
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12
sys/ia64/ia64/interrupt.c
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@ -108,20 +108,22 @@ SYSCTL_OPAQUE(_debug, OID_AUTO, rdvs, CTLFLAG_RW, &rdvs, sizeof(rdvs), "IU",
"");
#endif
SYSCTL_NODE(_debug, OID_AUTO, clock, CTLFLAG_RW, 0, "clock statistics");
static int adjust_edges = 0;
SYSCTL_INT(_debug, OID_AUTO, clock_adjust_edges, CTLFLAG_RW,
SYSCTL_INT(_debug_clock, OID_AUTO, adjust_edges, CTLFLAG_RD,
&adjust_edges, 0, "Number of times ITC got more than 12.5% behind");
static int adjust_excess = 0;
SYSCTL_INT(_debug, OID_AUTO, clock_adjust_excess, CTLFLAG_RW,
SYSCTL_INT(_debug_clock, OID_AUTO, adjust_excess, CTLFLAG_RD,
&adjust_excess, 0, "Total number of ignored ITC interrupts");
static int adjust_lost = 0;
SYSCTL_INT(_debug, OID_AUTO, clock_adjust_lost, CTLFLAG_RW,
SYSCTL_INT(_debug_clock, OID_AUTO, adjust_lost, CTLFLAG_RD,
&adjust_lost, 0, "Total number of lost ITC interrupts");
static int adjust_ticks = 0;
SYSCTL_INT(_debug, OID_AUTO, clock_adjust_ticks, CTLFLAG_RW,
SYSCTL_INT(_debug_clock, OID_AUTO, adjust_ticks, CTLFLAG_RD,
&adjust_ticks, 0, "Total number of ITC interrupts with adjustment");
int
@ -187,7 +189,7 @@ interrupt(u_int64_t vector, struct trapframe *tf)
if (adj == 0)
adjust_edges++;
adj = ia64_clock_reload >> 4;
} else if (delta < (ia64_clock_reload >> 3))
} else
adj = 0;
} else {
adj = 0;