[PlanetCCRMA] 3.0.9-1.rt25.1.fc16.ccrma.x86_64.rt poor performance

[Paolo Patruno]

I am trying the last kernel:

cat /proc/version 
Linux version 3.0.9-1.rt25.1.fc16.ccrma.x86_64.rt
(mockbuild at cm-matlab.stanford.edu) (gcc version 4.6.2 20111027 (Red Hat
4.6.2-1) (GCC) ) #1 SMP PREEMPT RT Sat Nov 12 18:20:19 PST 2011

/etc/init.d/rtirq status
  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	
   99 FF      80   - 120  0.0 S    irq/8-rtc0	
  715 FF      75   - 115  0.0 S    irq/47-hda_inte	
  687 FF      73   - 113  0.0 S    irq/16-hda_inte	
   85 FF      70   - 110  0.0 S    irq/17-ehci_hcd	
   89 FF      70   - 110  0.0 S    irq/16-ohci_hcd	
   87 FF      69   - 109  0.0 S    irq/19-ehci_hcd	
   91 FF      69   - 109  0.2 S    irq/16-ohci_hcd	
   93 FF      69   - 109  0.0 S    irq/18-ohci_hcd	
   95 FF      68   - 108  0.0 S    irq/18-ohci_hcd	
   97 FF      65   - 105  0.0 S    irq/1-i8042	
   96 FF      64   - 104  0.0 S    irq/12-i8042	
   28 FF      50   -  90  0.0 S    irq/9-acpi	
   77 FF      50   -  90  0.2 S    irq/22-ahci	
  196 FF      50   -  90  0.2 S    irq/45-radeon	
  625 FF      50   -  90  0.0 S    irq/4-ene_ir	
  674 FF      50   -  90  0.3 S    irq/17-ath9k	
 1381 FF      50   -  90  0.0 S    irq/46-p6p1	
    3 FF       1   -  41  0.5 S    ksoftirqd/0	
   18 FF       1   -  41  0.4 S    ksoftirqd/1	

I get those values from test:

cyclictest --smp -p 80 --duration=60
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.25 0.11 0.22 1/387 3127          

T: 0 ( 2996) P:80 I:1000 C:  59992 Min:      4 Act:  140 Avg:   90 Max:     245
T: 1 ( 2997) P:80 I:1500 C:  39995 Min:      5 Act:   14 Avg:   65 Max:     261

The values are more or less the same the I get from the standard kernel with threadirqs kernel parameter.
I am doing something wrong ?

Thanks

Paolo Patruno