bge driver, how to increase performance?

[Gleb Smirnoff]

On Wed, Nov 23, 2005 at 03:43:17PM +0100, Ferdinand Goldmann wrote:
F> I have a 3com 3c996-SX card running under FreeBSD 5.4-STABLE.
F> Performance is quite ok so far, but interrupt load is very high.
F> (Machine is working as a traffic shaping device/firewall)
F> 
F> # vmstat -i
F> interrupt                          total       rate
F> irq18: bge0                    153244636       5014
F> irq27: fxp0                    102056377       3339
F> 
F> Often, interrupt load will hit almost 100%. I guess the bge driver does not 
F> support polling, but I remember reading somewhere that it supports 
F> interrupt moderation? How would I enable this? On the em driver, this could 
F> be done via sysctl. Does anyone have hints on performance improvement 
F> concerning interrupt load?

It supports polling(4) in RELENG_6. (6.0-RELEASE is not enough)

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