[linux-dvb] setting voltage takes TONS of time

[jhall@UU.NET (Jeremy Hall)]

Hello,

I have discovered that an unmodified driver that is told to
SEC_SET_VOLTAGE takes over 11ms to complete this task.

The two calls that seem to generate the most amount of time are:

setPids(0,0,0,0,0); // takes up to 3 or 4 ms

return SecSetVoltage(val); takes upwards of 7.5 ms.  Can you think of a
reason for this to take so long? The kernel is 2.4.19-RC1 + ll + preempt +
firm timers.  The low latency and preempt patches help overall execution
of RT processes and firm timres helps with nanosleep, select, and other
sleepy tasks.  Without these, you don't get adequate sleep time, you may
overshoot by several ms.

thoughts?

This is with the HEAD CVS branch, not newstruct.


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