Question about isolating CPU's

Hi

I have a dual core CPU and want to reserve one core for RTAI,
so I start Linux with "isolcpus=0"

cat /proc/rtai/hal shows:

** RTAI/x86:

    CPU   Frequency: 998053000 (Hz)
    TIMER Frequency: 6238219 (Hz)
    TIMER Latency: 0 (ns)
    TIMER Setup: 160 (ns)

** Real-time IRQs used by RTAI:

    #45 at ffffffffa0119050
    #4352 at ffffffffa00b94a0
    #4353 at ffffffffa00b8cc0
    #4355 at ffffffff810dd8f0

** RTAI extension traps:

** RTAI SYSREQs in use: #1 #2

** MASK OF CPUs ISOLATED FOR RTAI: 0x1.

So far, everything is fine.

cat /proc/rtai/scheduler shows:

RTAI LXRT Real Time Task Scheduler.

    Calibrated Time Base Frequency: 998053000 Hz
    Calibrated user space latency: 2999 ns
    Calibrated kernel space latency: 2999 ns
    Calibrated oneshot timer setup_to_firing time: 160 ns

Number of RT CPUs in system: 2 (sized for 2)

Global heap: size =    2097152, used =      30592; <BSD>.
Kstack heap: size =     524288, used =          0; <BSD>.

Number of forced hard/soft/hard transitions: traps 0, syscalls 0

Priority  Period(ns)  FPU  Sig  State  CPU  Task  HD/SF  PID  RT_TASK *
 TIME
------------------------------------------------------------------------------
1000000000 0           Yes  No  0x3    0:1   1      0    959
2          0           Yes  No  0x3    0:1   2      1    1097
0          0           Yes  No  0x1    0:1   3      1    1099
1000000050 0           Yes  No  0x0    0:1   4      0    1105
TIMED

READY
1000000050 0           Yes  No  0x0    1:2   5      0    1089
1          0           Yes  No  0x3    1:2   6      1    1098
1000000050 0           Yes  No  0x0    1:2   7      0    1103
TIMED


Now, I expect all rt-task to be on the same core.
So what means the CPU column?

Can anybody help with interpreting the table above?

Thanks,
Felix
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