Date: Sat, 6 Aug 2011 20:47:36 -0300 From: Mario Lobo <lobo@bsd.com.br> To: freebsd-questions@freebsd.org Subject: High interrupt rate Message-ID: <201108062047.36472.lobo@bsd.com.br>
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Hi there;
My system is a FreeBSD 8.2-STABLE #0: Wed Jul 13 17:32:44 BRT 2011 i386
I have 4 nics. sis0, rl0, vr0 and dc0. The last three are in polling mode
(which I did to see if it would decrease the int amount).
The int rate for sis0 is low.
vmstat -i reports:
interrupt total rate
irq6: fdc0 1 0
irq14: ata0 163039 6
irq15: ata1 29 0
irq19: sis0 vr0 688525 29
irq20: ohci0 27 0
irq23: ehci0 2 0
cpu0: timer 46922025 2000
cpu1: timer 46918117 1999
Total 94691765 4036
But top reports:
last pid: 5163; load averages: 0.04, 0.09, 0.08
up 0+06:30:13 20:13:59
144 processes: 3 running, 121 sleeping, 20 waiting
CPU: 0.0% user, 0.0% nice, 1.2% system, 24.0% interrupt, 74.8% idle
Mem: 42M Active, 154M Inact, 116M Wired, 96K Cache, 112M Buf, 1667M Free
Swap: 4000M Total, 4000M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 2 171 ki31 0K 16K CPU0 0 706:33 103.37% idle
12 root 20 -32 - 0K 160K WAIT 1 67:16 97.46% intr
0 root 10 -68 0 0K 72K - 1 1:34 2.98% kernel
Systat reports:
1 users Load 0.12 0.11 0.08 Aug 6 20:15
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 56096 5076 194524 9784 1706152 count
All 113900 6624 2341492 13732 pages
Proc: Interrupts
r p d s w Csw Trp Sys Int Sof Flt cow 4042 total
73 6150 10 405 44 30k zfod fdc0
irq6
ozfod ata0
irq14
1.5%Sys 25.0%Intr 0.0%User 0.0%Nice 73.5%Idle %ozfod ata1
irq15
| | | | | | | | | | | daefr 44 sis0 vr0
1
=++++++++++++ prcfr ohci0 20
5 dtbuf totfr ehci0 23
Namei Name-cache Dir-cache 600000 desvn react 1999 cpu0:
time
Calls hits % hits % 27121 numvn pdwak 1999 cpu1:
time
943 frevn pdpgs
intrn
Disks ad0 ad1 cd0 pass0 118476 wire
KB/t 0.00 0.00 0.00 0.00 43796 act
tps 0 0 0 0 157764 inact
MB/s 0.00 0.00 0.00 0.00 96 cache
%busy 0 0 0 0 1706056 free
114880 buf
I know 75% idle is not bad but this machine, when not under load on a saturday
night like today, used to be at around 98% idle 99% of the time. Now its is at
72% idle 99.9% of the time. It has been like this all day.
The only things with a high interrupt rate are
cpu0: timer 46922025 2000
cpu1: timer 46918117 1999
What could be causing this?
thanks,
--
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since 2.2.8 [not Pro-Audio.... YET!!] (99% winblows FREE)
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