Messages in this thread | | | From | "Liangchen Zheng" <> | Subject | The values of gettimeofday() jumps. | Date | Sat, 28 May 2005 18:37:10 -0700 |
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Hello, We have several SMP machines (Tyan Tiger MPX motherboard, 2 AthlonMP 1900+ CPU, linux-2.4.21-20.EL). When running some time sensitive programs, I observed that the values of gettimeofday () jumped sometimes on a couple of machines (other machines are fine), from several hundreds milliseconds to a couple of seconds. I searched online and tried to figure out why this happened. It seems there are a lot of people who complained about the clock drift issue of gettimeofday () on SMP machines. But I still could not get the answers about what is the exact cause of this issue and how to fix it. Could somebody tell me some clues? Can this be solved by upgrading the kernel to 2.6? Thanks a lot.
By the way, I have read Linux SMP HOWTO and the following documents. http://seclists.org/lists/linux-kernel/2002/Jun/1524.html http://seclists.org/lists/linux-kernel/2002/Jun/1550.html http://alphalinux.org/archives/linux-alpha/April2000/0015.html I could not get enough clues from them yet, maybe because my limited knowledge about the kernel.
Regards, [Liangchen Zheng]
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