bge driver, how to increase performance?

[Ferdinand Goldmann]

Hello,

I have a 3com 3c996-SX card running under FreeBSD 5.4-STABLE.
Performance is quite ok so far, but interrupt load is very high.
(Machine is working as a traffic shaping device/firewall)

# vmstat -i
interrupt                          total       rate
irq18: bge0                    153244636       5014
irq27: fxp0                    102056377       3339

Often, interrupt load will hit almost 100%. I guess the bge driver does not 
support polling, but I remember reading somewhere that it supports interrupt 
moderation? How would I enable this? On the em driver, this could be done via 
sysctl. Does anyone have hints on performance improvement concerning interrupt 
load?

TIA
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