Description of problem: The clock is running too fast. How much faster depends on the load of the machine. When it is more or less idle, it can keep within a few percent. When the load rises (and also means network traffic rises if that might matter), it goes as much as 30% or more too fast. Version-Release number of selected component (if applicable): kernel-2.6.13-1.1532_FC4 How reproducible: Always, though load dependent Steps to Reproduce: 1.Automatic Additional info: This problem looks similar to some other reports, like bug 163347 and bug 152170. But it is not the same. I've never seen my clock go twice as fast as it should, and it does vary a lot with load. Also, those bugs seem to concern ATI motherboards only. My hardware is an Athlon 64 X2 CPU on an Asus A8N-SLI Deluxe motherboard. It has an Nvidia nForce 4 chipset.
2.6.14-1.1637_FC4 has been released as an update for FC4. Please retest with this update, as a large amount of code has been changed in this release, which may have fixed your problem. Thank you.
It took me a little while (I hit bug 173020) but now I've been running the 2.6.14-1.1637_FC4smp kernel for a couple of days, and so far ntp has not had any problems to keep the clock right. This problem seems to be solved.