Messages in this thread |  | | Date | Fri, 16 Feb 2007 22:28:30 +0800 | From | "Adam J. Richter" <> | Subject | Clock running at half speed in 2.6.20? |
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My system clock runs at approximately half speed in linux-2.6.20, 2.6.20-git10 and 2.6.20-git11. That is, it takes about two hours for "date" to report that one hour has elapsed. "hwclock" returns the correct time, of course.
I do not have this problem in linuux 2.6.18.1. I will try to narrow down the kernel version where this problem began.
The motherboard in question is an asus p4v8000-x, running a 2.8GHz Pentium 4 that has two hyperthreads, which I suspect may be the problem. I am just guessing, but perhaps some piece of code thinks the two hyperthreads are separate CPU's receving twice as many clock interrupts total. I expect to try to some experimentation to check this theory.
For what it's worth, I am running CONFIG_PREEMPT=y, CONFIG_PREEMPT_BKL=y, CONFIG_HZ=1000.
If there is a more specific mailing list for discussing this problem, I would be interested in knowning about it. The MAINTAINERS file lists several components with the word "clock" in them, but I believe that all are for drivers for hardware clocks or high resolution timer extensions. I tried a quick search of the linux-kernel mailing list for "clock" in the subject line, and did not notice anything that seemed like a match to this problem.
I will post more information as I collect it, but I am posting this bug report now in case this problem rings a bell for anyone.
Adam Richter - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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