Re: [5.99.41] clock skew

[BERTRAND Joel <joel.bertrand%systella.fr@localhost>]

Sujit K M a écrit :
> I quote from http://www.daemon-systems.org/man/ntpd.8.html)
>
> -x, --slew
>                Slew up to 600 seconds.
>
>                Normally, the time is slewed if the offset is less than the step
>                threshold, which is 128 ms by default, and stepped if above  the
>                threshold.   This  option  sets the threshold to 600 s, which is
>                well within the accuracy  window  to  set  the  clock  manually.
>                Note:  Since the slew rate of typical Unix kernels is limited to
>                0.5 ms/s, each second of  adjustment  requires  an  amortization
>                interval  of  2000 s.  Thus, an adjustment as much as 600 s will
>                take almost 14 days to complete.  This option can be  used  with
>                the -g and -q options.  See the tinker configuration file direc-
>                tive for other options.  Note: The  kernel  time  discipline  is
>                disabled with this option.

        I have tried without any success :

riemann# ntpd -n -d -x
ntpd 4.2.6-o Sun Dec 13 14:48:32 UTC 2009 (import)
addto_syslog: proto: precision = 8.000 usec
event at 0 0.0.0.0 c01d 0d kern kernel time sync enabled 
status=0x1<PLL,MODE=0x0=PLL,CLK=0x0=A>
Finished Parsing!!
addto_syslog: ntp_io: estimated max descriptors: 128, initial socket 
boundary: 20
addto_syslog: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
addto_syslog: Listen and drop on 1 v6wildcard :: UDP 123
addto_syslog: Listen normally on 2 le0 192.168.0.85 UDP 123
restrict: addr c0a80055 mask ffffffff mflags 00003000 flags 00000001
addto_syslog: Listen normally on 3 le0 fe80::a00:20ff:fe78:6e83 UDP 123
addto_syslog: Listen normally on 4 lo0 127.0.0.1 UDP 123
restrict: addr 7f000001 mask ffffffff mflags 00003000 flags 00000001
addto_syslog: Listen normally on 5 lo0 ::1 UDP 123
addto_syslog: Listen normally on 6 lo0 fe80::1 UDP 123
addto_syslog: Listening on routing socket on fd #27 for interface updates
key_expire: at 0 associd 13230
peer_clear: at 0 next 1 associd 13230 refid INIT
event at 0 192.168.0.128 8011 81 mobilize assoc 13230
newpeer: 192.168.0.85->192.168.0.128 mode 3 vers 4 poll 6 10 flags 0x1 
0x1 ttl 0 key 00000000
event at 0 0.0.0.0 c016 06 restart
event at 0 0.0.0.0 c012 02 freq_set ntpd 0.000 PPM
event at 0 0.0.0.0 c011 01 freq_not_set
transmit: at 1 192.168.0.85->192.168.0.128 mode 3 len 48
auth_agekeys: at 1 keys 1 expired 0
receive: at 1 192.168.0.85<-192.168.0.128 mode 4 len 48
event at 1 192.168.0.128 8024 84 reachable
clock_filter: n 1 off 0.001928 del 0.000848 dsp 7.937505 jit 0.000008
transmit: at 67 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 67 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 2 off 0.005789 del 0.000887 dsp 3.937755 jit 0.003861
transmit: at 134 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 134 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 3 off -0.957518 del 0.000754 dsp 1.938009 jit 0.961378
transmit: at 200 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 200 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 4 off -1.921037 del 0.000860 dsp 0.938192 jit 1.667215
transmit: at 267 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 267 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 5 off -1.917218 del 0.001017 dsp 0.438322 jit 1.440670
transmit: at 334 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 334 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 6 off -2.396893 del 0.000786 dsp 0.188403 jit 1.676637
transmit: at 398 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 398 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 7 off -2.393055 del 0.000862 dsp 0.063429 jit 1.527547
transmit: at 462 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 462 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -2.873037 del 0.000778 dsp 0.000945 jit 1.792814
transmit: at 529 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 529 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -3.352658 del 0.000777 dsp 0.000962 jit 1.820136
transmit: at 593 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 593 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -4.316154 del 0.000802 dsp 0.000949 jit 2.176653
transmit: at 660 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 660 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -5.279447 del 0.000928 dsp 0.000964 jit 2.663379
transmit: at 725 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 725 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -6.242732 del 0.000733 dsp 0.000957 jit 3.221968
transmit: at 791 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 791 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -6.722613 del 0.000861 dsp 0.000961 jit 3.201268
transmit: at 858 192.168.0.85->192.168.0.128 mode 3 len 48
receive: at 858 192.168.0.85<-192.168.0.128 mode 4 len 48
clock_filter: n 8 off -7.202363 del 0.000859 dsp 0.000970 jit 3.159376

        Regards,

        JKB