* Steven Rostedt <[email protected]> wrote:
> > 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?
yes, i found this problem too, a week ago or so. It's due to the GTOD
changes to i386's __delay() function. Does it still occur with -rt15
[which has the -B11 GTOD patchset] ?
Ingo
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