Messages in this thread | | | Date | Wed, 09 Jan 2002 10:08:00 +0100 | From | Helge Hafting <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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Andrew Morton wrote: [...] > I haven't seen any figures for embedded XP, but it is said that > if you bend over backwards you can get 10 milliseconds out of NT4, > and 4-5 out of the fabled BeOS. This is one area where we can > fairly easily be very much the best. It's low-hanging fruit. > > Internal preemptability is, in my opinion, the best way to deliver > this. > > I accept your point about it making debugging harder - I would > suggest that the preempt code be altered so that it can be disabled > at runtime, rather than via a rebuild. I suspect this can be > done at zero cost by setting init_task's preempt count to 1000000 > via a kernel boot option. And at almost-zero cost via a sysctl.
And with some bad luck, the bug goes away when you do this. The bug of the missing lock...
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