On 06/11/2010 04:47 PM, David L. Mills wrote:
My scenario did include the condition of eight valid sample before pulling the plug The first missed poll response did result in one MAXDISPERSE sample in the filter, but that is completely irrelevant. The point is the poll routine calls clock_select() for every poll sent when the last four samples in the reach register are missing, so it is guaranteed that the server be marked down after that.
For entertainment value, 'ntpq cartoons' with 4 samples, and 8 samples: At 2 minutes after pulling the plug, there is a difference. 4: 10.5.5.254 10.5.5.16 2 u 1 8 1 0.284 -0.294 0.000 10.5.5.254 10.5.5.16 2 u 1 8 3 0.340 -0.217 0.078 10.5.5.254 10.5.5.16 2 u 8 8 7 0.285 -0.121 0.140 *10.5.5.254 10.5.5.16 2 u 3 8 17 0.286 0.044 0.265 *10.5.5.254 10.5.5.16 2 u 9 8 36 0.286 0.044 0.265 *10.5.5.254 10.5.5.16 2 u 17 8 74 0.286 0.044 0.265 *10.5.5.254 10.5.5.16 2 u 24 8 170 0.286 0.044 0.265 *10.5.5.254 10.5.5.16 2 u 33 8 360 0.284 -0.294 0.224 *10.5.5.254 10.5.5.16 2 u 43 8 340 0.284 -0.294 0.224 *10.5.5.254 10.5.5.16 2 u 49 8 300 0.284 -0.294 0.224 *10.5.5.254 10.5.5.16 2 u 61 8 200 0.284 -0.294 0.224 *10.5.5.254 10.5.5.16 2 u 64 8 0 0.285 -0.121 0.135 *10.5.5.254 10.5.5.16 2 u 158 8 0 0.286 0.044 0.000 *10.5.5.254 10.5.5.16 2 u 337 8 0 0.286 0.044 0.000 8: 10.5.5.254 10.5.5.16 2 u 3 8 1 0.294 2.971 0.000 10.5.5.254 10.5.5.16 2 u 1 8 3 0.295 3.434 0.463 10.5.5.254 10.5.5.16 2 u 1 8 7 0.288 3.092 0.256 *10.5.5.254 10.5.5.16 2 u 2 8 17 0.277 3.141 0.198 *10.5.5.254 10.5.5.16 2 u 2 8 37 0.277 3.141 0.200 *10.5.5.254 10.5.5.16 2 u 4 8 77 0.277 3.141 0.186 *10.5.5.254 10.5.5.16 2 u 3 8 177 0.277 3.141 0.182 *10.5.5.254 10.5.5.16 2 u 1 8 377 0.277 3.141 0.224 *10.5.5.254 10.5.5.16 2 u 11 8 376 0.277 3.141 0.304 *10.5.5.254 10.5.5.16 2 u 18 8 374 0.277 3.141 0.304 *10.5.5.254 10.5.5.16 2 u 27 8 370 0.277 3.141 0.304 *10.5.5.254 10.5.5.16 2 u 36 8 360 0.277 3.141 0.306 *10.5.5.254 10.5.5.16 2 u 43 8 340 0.277 3.141 0.334 *10.5.5.254 10.5.5.16 2 u 49 8 300 0.278 2.932 0.317 *10.5.5.254 10.5.5.16 2 u 58 8 200 0.283 2.750 0.443 *10.5.5.254 10.5.5.16 2 u 67 8 0 0.283 2.750 0.409 *10.5.5.254 10.5.5.16 2 u 73 8 0 0.283 2.750 0.178 10.5.5.254 10.5.5.16 2 u 82 8 0 0.283 2.572 0.000 10.5.5.254 10.5.5.16 2 u 88 8 0 0.283 2.572 0.000 10.5.5.254 10.5.5.16 2 u 94 8 0 0.283 2.572 0.000 10.5.5.254 10.5.5.16 2 u 104 8 0 0.283 2.572 0.000 As to whether this difference means anything, I will let others decide. The above is 4.2.7p34. Also tested on 4.2.4p7. Spaces were shortened to fit. /Kasper Pedresen _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
