1: #! @PATH_PERL@ -w
2:
3: die "perl5 needed\n" unless ($] > 5);
4:
5: use Getopt::Std;
6: use vars qw($opt_n);
7:
8: getopts('d:nt:');
9:
10: #chop($ncpu = `sysctl -n hw.ncpu`);
11: #die "Found $ncpu CPUs; can only be run on systems with 1 CPU.\n" if ($ncpu > 1);
12:
13: $driftfile = "/etc/ntp.drift";
14: $driftfile = $opt_d if defined($opt_d);
15:
16: chop($timer = `sysctl -n kern.timecounter.hardware 2> /dev/null`);
17:
18: $timer =~ tr/\U/\L/;
19:
20: if ($timer eq '') {
21: open(DM, "/var/run/dmesg.boot");
22: while(<DM>) {
23: # Timecounter "i8254" frequency 1193182 Hz
24: if (/^Timecounter "(\w+)"\s+/) {
25: $timer = $1;
26: last;
27: }
28: }
29: close(DM);
30: }
31:
32: $opt_t = $timer if !defined($opt_t);
33:
34: if ($timer ne '') { # $timer found...
35: if ($opt_t ne '') { # - and $opt_t found
36: if ($timer ne $opt_t) { # - - and they differ
37: warn "You specified a $opt_t timer but I detected a $timer timer.\n";
38: usage();
39: exit 1;
40: } else { # - - and they are the same
41: ;
42: }
43: } else { # - but no $opt_t specified; this is OK
44: ;
45: }
46: } else { # No $timer found...
47: if ($opt_t ne '') { # - but $opt_t was specified
48: $timer = $opt_t; # - - so use it.
49: } else { # - and neither was $opt_t
50: warn "I can't tell what timer you have. Please specify one.\n";
51: usage();
52: exit 1;
53: }
54: }
55:
56: open(DF, $driftfile) || die "Can't open driftfile ($driftfile): $!\n";
57: while(<DF>) {
58: chop;
59: if (/^(-?\d+\.\d+)(\s\d)?$/) {
60: $drift = $1;
61: } else {
62: die "Bogus value in driftfile $driftfile: <$_>\n";
63: }
64: }
65: close(DF);
66:
67: print "NTP drift is <$drift>\n";
68:
69: # Convert from NTP's idea of PPM to a decimal equivalent
70: $freq_adj = int ( $drift * ( 10 ** 6 / 2 ** 20) );
71: print "normalized freq_adj is <$freq_adj>\n";
72:
73: $freq_adj = int ( ( $freq_adj - 1 ) / 2 );
74: print "Applying freq_adj of <".-$freq_adj.">\n";
75:
76: $sysctl = "machdep.".$timer."_freq";
77:
78: chop($mach_freq = `sysctl -n $sysctl`);
79:
80: print "$sysctl is <$mach_freq>\n";
81:
82: $n_mach_freq = $mach_freq - $freq_adj;
83:
84: if (defined($opt_n)) {
85: print "$sysctl $mach_freq -> $n_mach_freq\n";
86: } else {
87: print "i8254: ".`sysctl -w $sysctl=$n_mach_freq`;
88: }
89:
90: sub usage {
91: print STDERR <<EOUsage
92: Usage: $0 [-d drift_file] [-n] [-t timer]
93: where "drift_file" defaults to /etc/ntp.drift
94: and "timer" is usually "tsc" or "i8254"
95: and "-n" says "don't really change anything, just say what would happen".
96: EOUsage
97: }
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