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

[Ingo Molnar <mingo@elte.hu>]

* 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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