98 lines
2.3 KiB
Plaintext
98 lines
2.3 KiB
Plaintext
#! @PATH_PERL@ -w
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die "perl5 needed\n" unless ($] > 5);
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use Getopt::Std;
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use vars qw($opt_n);
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getopts('d:nt:');
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#chop($ncpu = `sysctl -n hw.ncpu`);
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#die "Found $ncpu CPUs; can only be run on systems with 1 CPU.\n" if ($ncpu > 1);
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$driftfile = "/etc/ntp.drift";
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$driftfile = $opt_d if defined($opt_d);
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chop($timer = `sysctl -n kern.timecounter.hardware 2> /dev/null`);
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$timer =~ tr/\U/\L/;
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if ($timer eq '') {
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open(DM, "/var/run/dmesg.boot");
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while(<DM>) {
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# Timecounter "i8254" frequency 1193182 Hz
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if (/^Timecounter "(\w+)"\s+/) {
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$timer = $1;
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last;
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}
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}
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close(DM);
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}
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$opt_t = $timer if !defined($opt_t);
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if ($timer ne '') { # $timer found...
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if ($opt_t ne '') { # - and $opt_t found
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if ($timer ne $opt_t) { # - - and they differ
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warn "You specified a $opt_t timer but I detected a $timer timer.\n";
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usage();
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exit 1;
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} else { # - - and they are the same
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;
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}
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} else { # - but no $opt_t specified; this is OK
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;
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}
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} else { # No $timer found...
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if ($opt_t ne '') { # - but $opt_t was specified
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$timer = $opt_t; # - - so use it.
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} else { # - and neither was $opt_t
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warn "I can't tell what timer you have. Please specify one.\n";
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usage();
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exit 1;
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}
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}
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open(DF, $driftfile) || die "Can't open driftfile ($driftfile): $!\n";
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while(<DF>) {
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chop;
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if (/^(-?\d+\.\d+)(\s\d)?$/) {
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$drift = $1;
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} else {
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die "Bogus value in driftfile $driftfile: <$_>\n";
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}
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}
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close(DF);
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print "NTP drift is <$drift>\n";
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# Convert from NTP's idea of PPM to a decimal equivalent
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$freq_adj = int ( $drift * ( 10 ** 6 / 2 ** 20) );
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print "normalized freq_adj is <$freq_adj>\n";
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$freq_adj = int ( ( $freq_adj - 1 ) / 2 );
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print "Applying freq_adj of <".-$freq_adj.">\n";
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$sysctl = "machdep.".$timer."_freq";
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chop($mach_freq = `sysctl -n $sysctl`);
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print "$sysctl is <$mach_freq>\n";
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$n_mach_freq = $mach_freq - $freq_adj;
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if (defined($opt_n)) {
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print "$sysctl $mach_freq -> $n_mach_freq\n";
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} else {
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print "i8254: ".`sysctl -w $sysctl=$n_mach_freq`;
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}
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sub usage {
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print STDERR <<EOUsage
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Usage: $0 [-d drift_file] [-n] [-t timer]
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where "drift_file" defaults to /etc/ntp.drift
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and "timer" is usually "tsc" or "i8254"
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and "-n" says "don't really change anything, just say what would happen".
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EOUsage
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}
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