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Subjectirq 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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