>It would be interesting to know what kernel version those who are having >trouble with unstable drift in Linux are using. I am using kernel >2.6.27.7, and it is very stable, varying no more than 5 PPM, even across >reboots. It should be noted that I rebuilt my kernel with the timer >frequency set to 100HZ, and made sure that dynamic ticks was disabled. >This seems to produce the lowest drift values. In an older 2.6 kernel, >I noticed the drift rate jumping all over the place as described. >However, it appears that this may have finally been fixed.
What version of the kernel fixed what bug? I just installed 2.6.28.1 and patched the startup code to loop and print the TSC calibration info. Jan 20 17:53:54 mini-mon kernel: Detected 1000.152 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.093 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.179 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.152 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.096 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.091 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.150 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.134 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.121 MHz processor. Jan 20 17:53:54 mini-mon kernel: Detected 1000.103 MHz processor. That's 88 ppm peak to peak. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
