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On Fri, 2005-11-25 at 11:26 +0100, Schultheiss, Christoph wrote: > kernel: 2.6.14 with and without the realtime-preempt patch > > hi list, > > after measuring the duration of the function udelay (with oscilloscope > at parallel port), I figured out that udelay (5usec) with activated > realtime- preempt patch lasts a little bit longer. Without the patch the > time is exact. > All kernel debug switches are turned off at compile time. > Can anyone suggest why this happens? Well, the -rt patch, has changed the udelay function. BTW, you are using the constant udelay, right? Maybe an example of the code you used to test might be useful. Ingo or John? -- Steve - 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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