polling(4) and rl(4)

[Ruslan Ermilov]

Hey Luigi,

Have you actually measured the performance of rl(4) with polling(4)
enabled?  With 8139 anomaly of four (register based) TX descriptors
it's becoming a royal pain in the ass with polling(4) enabled --
the TX performance just sucks -- I could only get the comparable
results with HZ=5000, which is overheating my CPU.  My suggestion
is to drop polling(4) support from the rl(4) driver completely.

Are there any objections?  Has anybody got different results with
rl(4) and polling(4) enabled?

Having it in re(4) is of course a good thing.  ;)

As an aside, I've started working on the ``[-]polling'' option for
ifconfig(8) that, when done, will allow changing the polling status
of individual interfaces in run-time, e.g., the following command
will disable polling on nge0:

	ifconfig nge0 -polling


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer
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