Why can some NIC use polling and others not ?
eg I went to turn on polling on my BCM5782 Broadcom NetXtreme Gigabit
Ethernet Card. And bge(4) doesn't mention anything about polling.
Is it a hardware feature of the NIC ?
- aW
0n Wed, Nov 17, 2004 at 09:13:51PM +0300, Yar Tikhiy wrote:
Hi there,
I can't but remind you that there's polling(4) in FreeBSD :-)
Until today, I was convinced for some obscure reason that polling(4)
was an experimental feature that might or might not work. Today I
tried it on our central router box and got astounding results.
The router box is a 1.4GHz Celeron PC with an fxp(4) interface split
across a dozen of vlans. There is nothing special about its setup
except for ~250 rules loaded into ipfw2. It is running 4.10-RELEASE.
Without polling, it was able to switch full 10Mbytes/sec of traffic
(~9kpps), but that took from 50 to 70% CPU time spent in interrupts.
With polling on, interrupt time never exceeds 5% and it stays as low
as 1-2% on average even when traffic is that high.
Many thanks to folks who have had a hand in polling(4) development!
Just in case: Please be aware that polling(4) won't make KDE run
faster unless on a busy router ;-)
--
Yar
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