irq balance problems?

hi

i have kernel 2.6.9, with FC2, on an AMD64 Dual Opteron.

[root@btv 28]# cat /proc/interrupts
           CPU0       CPU1
  0:   22249515   39262513    IO-APIC-edge  timer
  1:          0          8    IO-APIC-edge  i8042
  2:          0          0          XT-PIC  cascade
  8:          0          0    IO-APIC-edge  rtc
 14:          1         13    IO-APIC-edge  ide0
 24:         10  441422068   IO-APIC-level  ioc0, eth1
 25:  171765170       5905   IO-APIC-level  ioc1, eth2
 28:        921     406066   IO-APIC-level  eth0
NMI:      16960       6317
LOC:   61500529   61500464
ERR:          0
MIS:          0

i was wondering, if IRQ28's (eth0) affinity is set to the default "f"

[root@btv 28]# cat /proc/irq/prof_cpu_mask
f
[root@btv 28]# cat /proc/irq/28/smp_affinity
f


and irqbalance is not running, why aren't the interrupts coming from eth0
balanced between the two processors? at least that's what i understood from the
examples in Documentation/IRQ-affinity.txt. are there any other settings/kernel
parameters/compile option one has to set?

(pls msg me in private, i'm not on the list.)
thanks

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