Preempt of BKL and with tickless systems

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I think I have a reasonable grip on the voluntary and full preempt models, can anyone give me any wisdom on the preempt of the BKL? I know what it does, the question is where it might make a difference under normal loads. Define normal as servers and desktops.

I've been running some sched tests, and it seems to make little difference how that's set. Before I run a bunch of extra tests, I thought I'd ask.


New topic: I have found preempt, both voluntary and forced, seems to help more with response as the HZ gets smaller. How does that play with tickless operation, or are you-all waiting for me to run my numbers with all values of HZ and not, and tell the world what I found? ;-)

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Bill Davidsen <[email protected]>
  "We have more to fear from the bungling of the incompetent than from
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