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From: Yevgeniy Aleynikov <eugenea@infospace.com>
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Subject: i386/61646: Strange irq20 weirdness causing system load
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>Number: 61646
>Category: i386
>Synopsis: Strange irq20 weirdness causing system load
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-i386
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jan 20 12:20:14 PST 2004
>Closed-Date:
>Last-Modified:
>Originator: Yevgeniy Aleynikov
>Release: 5.2-RELEASE made with make world from CVS
>Organization:
none
>Environment:
FreeBSD gate.home 5.2-RELEASE FreeBSD 5.2-RELEASE #1: Sat Jan 17 00:25:19 PST 2004 eugene@gate.home:/.1/obj/.1/src/sys/gate2 i386
>Description:
After upgrade from 5.1 to 5.2 my system became very slow, spending alot of time for IRQ20 interrupts (which is probably routed to timer interrupt).
Here's top output in idle system state:
last pid: 17584; load averages: 0.26, 0.28, 0.30 up 2+20:11:35 12:06:17
65 processes: 1 running, 64 sleeping
CPU states: 0.2% user, 0.0% nice, 0.8% system, 46.7% interrupt, 52.3% idle
Mem: 63M Active, 306M Inact, 80M Wired, 24M Cache, 60M Buf, 22M Free
Swap: 512M Total, 80K Used, 512M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND
17584 xxxxxx -52 0 2288K 1400K CPU0 0 0:00 1.54% 0.15% top
Here's systat output:
/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average ||
/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100
root irq20: acp XXXXXXXXXXXXXXXXXX
root idle: cpu0 XXXXXXXXXXX
root idle: cpu1 XXXXXXXXXX
<idle> XXXXXXXXXX
> vmstat -i
interrupt total rate
irq4: sio0 115 0
irq5: sbc0 10479 0
irq6: fdc0 5 0
irq8: rtc 31431572 128
irq14: ata0 299080 1
irq16: sis0 2856265 11
irq17: ed0 2726682 11
irq18: ahc0 270 0
irq19: uhci0 2 0
irq20: acpi0 2548283659 10377
irq0: clk 24555474 99
Total 2610163603 10629
Here's lines from dmesg.boot:
ACPI APIC Table: <ASUS P2B-D >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 1
cpu1 (AP): APIC ID: 0
ioapic0 <Version 1.1> irqs 0-23 on motherboard
Pentium Pro MTRR support enabled
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <ASUS P2B-D > on motherboard
acpi0: Overriding SCI Interrupt from IRQ 9 to IRQ 20
Let me know if you need more info.
>How-To-Repeat:
Boot system, watch system (interrupts) load.
>Fix:
None
>Release-Note:
>Audit-Trail:
>Unformatted: