Re: device pooling and high interrupts
From: Dmitry Morozovsky (marck_at_rinet.ru)
Date: 04/24/04
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Date: Sat, 24 Apr 2004 22:03:10 +0400 (MSD) To: GiZmen <gizmen@blurp.one.pl>
On Sat, 24 Apr 2004, GiZmen wrote:
G> I am runnign freebsd 5.2.1 on 386 arch with two rl lan cards. My mainboard
G> is on VIA KT 266A with AMD athlon 1.1.
G> I read man polling and i have HZ=1000. My problem is that when i set up
G> sysctl variable kern.polling.enable=1 my interrupts greatly increase.
G> When my system is idle and indicate 0-1% interrupts with out polling.
G> and when i turn on polling interrupts goes up to about 20% on idle system.
G> Is it normal ? I never before use polling and i dont know that i have
G> something bad in my system ?
G>
G> Can somebody explain me this ?
It seems pretty normal under such low load. polling is worth turning on when
you have interrupt load spikes more than, say, 40-50% (e.g. highly saturated
100Mbps router with more than two interfaces and/or VLANs)
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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