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Here's the info on my hyperthreaded dual p4 box:

$uname -a
Linux h3apI 2.6.24-rt #1 SMP PREEMPT RT Fri Oct 24 20:05:28 PDT 2008 i686 Intel(R) XEON(TM) CPU 2.40GHz GenuineIntel GNU/Linux

That's patched with Ingos rt21 set.

$ps -e | grep timer
    4 ?        00:00:00 posix_cpu_timer
    6 ?        00:09:22 sirq-timer/0
   12 ?        00:00:00 sirq-hrtimer/0
   16 ?        00:00:00 posix_cpu_timer
   18 ?        00:09:47 sirq-timer/1
   24 ?        00:00:00 sirq-hrtimer/1
   28 ?        00:00:00 posix_cpu_timer
   30 ?        00:09:02 sirq-timer/2
   36 ?        00:00:00 sirq-hrtimer/2
   40 ?        00:00:00 posix_cpu_timer
   42 ?        00:08:36 sirq-timer/3
   48 ?        00:00:00 sirq-hrtimer/3

$cat /proc/interrupts 
           CPU0       CPU1       CPU2       CPU3       
  0:        494          0          0          0   IO-APIC-edge      timer
  1:      27921       6850          0       2513   IO-APIC-edge      i8042
  2:          0          0          0          0    XT-PIC-XT        cascade
  8:          0          0          0          0   IO-APIC-edge      rtc
 12:    1845583     322255      72671      33572   IO-APIC-edge      i8042
 14:     347395      23661       3632          0   IO-APIC-edge      ide0
 15:         88          0          0          0   IO-APIC-edge      ide1
 16:          0          0          0          0   IO-APIC-fasteoi   radeon@pci:                  0000:01:00.0
 18:   15703931   13593767      14182     639202   IO-APIC-fasteoi   ICE1712
 19:         30          0          0          0   IO-APIC-fasteoi   sym53c8xx
 21:    3945340    1262316     242087          0   IO-APIC-fasteoi   eth0
 23:      23850          0          0          0   IO-APIC-fasteoi   sym53c8xx
NMI:          0          0          0          0   Non-maskable interrupts
LOC:  252239131  252239065  252239045  252239024   Local timer interrupts
RES:   31462863   28528083   43355488   24139603   Rescheduling interrupts
CAL:     279909     280300     286130     292476   function call interrupts
TLB:      79244      68155      70767      75887   TLB shootdowns
TRM:          0          0          0          0   Thermal event interrupts
SPU:          0          0          0          0   Spurious interrupts
ERR:          0
MIS:          0