I am using a Pharos GPS-500 Model X13-51914 GPS sensor from a MS DeLorme mapping package as a stratum 0 timesource for my local timeserver. (As a matter of fact, I bought the sensor for that purpose.) It is working beautifully, and reporting zero jitter once I turned the port up to 115200bps.
There's just one problem, which comes up when I need to shut down the machine, reboot, or otherwise stop ntpd for any reason. If ntpd has been running for more than a short period (I'm not sure how long the "safe" run time is)), it will fail to stop, and will in fact completely lock up the system. I can sometimes, not always, get it to stop properly by sending it a SIGKILL instead of SIGTERM. The GPS sensor, on its USB-serial converter, shows up on the USB bus like so: babylon5:alaric:~:3 $ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 005: ID 058f:6361 Alcor Micro Corp. Multimedia Card Reader Bus 004 Device 002: ID 03f0:1105 Hewlett-Packard ScanJet 5470c/5490c Bus 004 Device 003: ID 045e:0040 Microsoft Corp. Wheel Mouse Optical Bus 004 Device 004: ID 067b:aaa0 Prolific Technology, Inc. Prolific Pharos Bus 003 Device 002: ID 04d9:1603 Holtek Semiconductor, Inc. The reference clock is configured as follows in ntp.conf: server 127.127.20.0 prefer minpoll 4 mode 80 fudge 127.127.20.0 flag3 1 flag2 0 time1 0.0 stratum 0 Kernel modules in use for GPS: pps_ktimer 1394 0 pps_ldisc 1987 0 pps_core 6394 2 pps_ktimer,pps_ldisc pl2303 11242 1 usbserial 31191 3 pl2303 This failure-to-stop occurs ONLY with the GPS sensor in use. Has anyone encountered a similar problem? Any suggestions as to possible cause or workaround? Do I perhaps need to disconnect the GPS sensor (or perhaps just unload the applicable kernel modules) before trying to stop ntpd? Any tips would be appreciated. -- Phil Stracchino Babylon Communications [email protected] [email protected] Landline: 603.293.8485 _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
