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

[Sunil Naidu]

Hi Ingo,

I did boot with (almost) no problems. Here is ps ax info:-

PID TTY      STAT   TIME COMMAND
   1 ?        Ss     0:00 init [5]
   2 ?        S      0:00 [migration/0]
   3 ?        S      0:00 [posix_cpu_timer]
   4 ?        S      0:00 [softirq-high/0]
   5 ?        S      0:00 [softirq-timer/0]
   6 ?        S      0:00 [softirq-net-tx/]
   7 ?        S      0:00 [softirq-net-rx/]
   8 ?        S      0:00 [softirq-block/0]
   9 ?        S      0:00 [softirq-tasklet]
  10 ?        S      0:00 [softirq-sched/0]
  11 ?        S      0:00 [softirq-hrtimer]
  12 ?        S      0:00 [softirq-rcu/0]
  13 ?        S<     0:00 [desched/0]
  14 ?        S      0:00 [migration/1]
  15 ?        S      0:00 [posix_cpu_timer]
  16 ?        S      0:00 [softirq-high/1]
  17 ?        S      0:00 [softirq-timer/1]
  18 ?        S      0:00 [softirq-net-tx/]
  19 ?        S      0:00 [softirq-net-rx/]
  20 ?        S      0:00 [softirq-block/1]
  21 ?        S      0:00 [softirq-tasklet]
  22 ?        S      0:00 [softirq-sched/1]
  23 ?        S      0:00 [softirq-hrtimer]
  24 ?        S      0:00 [softirq-rcu/1]
  .........
  .........

Here is the interrupt info:-

          CPU0       CPU1
 0:        354          0   IO-APIC-edge      timer
 1:        361          0   IO-APIC-edge      i8042
 8:          1          0   IO-APIC-edge      rtc
 9:          0          0   IO-APIC-fasteoi   acpi
12:          7          0   IO-APIC-edge      i8042
14:       1985          0   IO-APIC-edge      ide0
16:      13042          0   IO-APIC-fasteoi   uhci_hcd:usb4, HDA
Intel, i915@pci:0000:00:02.0
18:          0          0   IO-APIC-fasteoi   uhci_hcd:usb3
19:      11520          0   IO-APIC-fasteoi   uhci_hcd:usb2, libata
20:          2          0   IO-APIC-fasteoi   uhci_hcd:usb1, ehci_hcd:usb5
21:        515          0   IO-APIC-fasteoi   eth0
NMI:          0          0
LOC:      23573      24545
ERR:          0
MIS:          0


I did get REMINDER, the following debugging options are turned on in
your .config:

       CONFIG_CRITICAL_IRQSOFF_TIMING
       CONFIG_FUNCTION_TRACE

This I have understood, no issues here.

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


Thanks,

~Su37
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