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    SubjectRe: 2.6.20-rc6-rt2 - SMP/x86 -- questions about .config selection

    * Sunil Naidu <akula2.shark@gmail.com> wrote:

    > There is some confusion for me while configuring a rt kernel &
    > proceeding for experiments. I did choose the following:-
    >
    > NO_HZ=y
    > HIGH_RES_TIMERS=y
    > SMP=y
    > PREEMPT_VOLUNTARY=y
    > PREEMPT_SOFTIRQS=y
    > PREEMPT_HARDIRQS=y
    > SPINLOCK_BKL=y
    > CLASSIC_RCU=y
    > SCHED_SMT=y
    > IRQBALANCE=y
    > HZ_1000=y
    >
    >
    > #1 Is this correct to say PREEMPT_VOLUNTARY=y for rt on this desktop
    > #PC?

    well, PREEMPT_RT is the best preemption method.

    > #2 I am not clear about IRQ config selection (which one should be
    > enable/disable for a PC, I did select all as shown in the above
    > config). Any suggestion?

    it's OK. If you select PREEMPT_RT then all the necessary preemption
    options get auto-selected for you.

    > #3 Any other parameter(s) I need to enable/disable to get better
    > results? (did disable APM)

    check out the configs of the -rt yum repository, those are pretty
    optimal:

    http://people.redhat.com/mingo/realtime-preempt/yum/

    Ingo
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