Messages in this thread | | | Date | Mon, 3 May 1999 19:23:19 +0200 (CEST) | From | "Pascal A. Dupuis" <> | Subject | time jumps |
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Hello,
I've written a device driver under 2.0.37. Having acquired a block of data, the interrupt routine add a timestamp obtained with do_gettimeofday. In the higher layers, I compute the difference between two consecutive timestamps to assert there is no missing data.
Most of the time, diff time is 792 millisec, but sometime I find two sequences, one with 782 millisec, and the other with 802 millisec. The deviation from normal sequence is 10 millisec, which is also 1/Hz (i386 arch)
I suppose that when my driver, from its interrupt routine, call do_gettimeofday, there is a timer interrupt pending. Is it something I could do to be sure the timer interrupt is serviced, if required, before reading the time ?
Thanks in advance
Pascal A. Dupuis
-- Premature optimization is the root of all evil. -- D.E. Knuth
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