Date: Mon, 26 Jul 2004 12:21:17 +1000 From: Alex Helbig <alex@helbig.cc> To: freebsd-questions@freebsd.org Cc: alex Helbig <alex@helbig.cc> Subject: High interrupt load under 5.2.1-RELEASE Message-ID: <6.0.0.22.0.20040726121625.01d9fbf0@smtp.muse.org.au>
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Hi Everyone,
I am having some issues with 5.2.1-RELEASE on an Intel SE7500WV2 with
an Intel SRCU42L Raid controller. The issue I have is the number of
interrupts per second being caught by the code for either the em or iir
device. The output of vmstat and top will show what I mean:
%vmstat -i
interrupt total rate
irq1: atkbd0 163 0
irq6: fdc0 3 0
irq8: rtc 803888 127
irq9: em0 em1 iir0+ 360580529 57408
irq13: npx0 1 0
irq15: ata1 49 0
irq0: clk 628017 99
Total 362012650 57636
%top -s
last pid: 829; load averages: 0.89, 0.71, 0.62
54 processes: 5 running, 41 sleeping, 7 waiting, 1 lock
CPU states: 0.1% user, 0.0% nice, 0.4% system, 14.4% interrupt, 85.2% idle
Mem: 6944K Active, 6012K Inact, 39M Wired, 9312K Buf, 1952M Free Swap:
4071M Total, 4071M Free
PID USERNAME PRI NICE SIZE RES
STATE C TIME WCPU CPU COMMAND
11 root -16 0 0K 12K CPU3 3 104:59 99.02%
99.02% idle: cpu3
12 root -16 0 0K 12K RUN 2 104:58 99.02%
99.02% idle: cpu2
13 root -16 0 0K 12K CPU1 1 104:42 99.02%
99.02% idle: cpu1
22 root -68 -187 0K 12K *Giant 0 61:32 55.18%
55.18% irq9: em0 em1 iir0+
14 root -16 0 0K 12K CPU0 0 42:46 40.77%
40.77% idle: cpu0
829 alexh -68 0 2208K 1468K CPU2 2 0:00 6.66% 0.63% top
%dmesg | head -n 15
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993,
1994
The Regents of the University of California. All rights
reserved.
FreeBSD 5.2.1-RELEASE #0: Mon Feb 23 20:45:55 GMT 2004
root@wv1u.btc.adaptec.com:/usr/obj/usr/src/sys/GENERIC
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0a35000.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc0a35244.
ACPI APIC Table: <INTEL SWV20 >
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) XEON(TM) CPU 2.40GHz (2392.95-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf24 Stepping = 4
Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM>
Hyperthreading: 2 logical CPUs
real memory = 2147418112 (2047 MB)
avail memory = 2080645120 (1984 MB)
The points that seem relevant to me in diagnosing this are:
* This is a default install of 5.2.1-RELEASE. No custom kernel, no
additional software installed.
* The box is currently doing nothing other than sitting in a rack
* The same box with 5.1-RELEASE did not exhibit this behavior
* It seems that the em and iir devices are all sitting behind IRQ9 - I
suspect this is not a good thing for when the box does become loaded
Does anyone have any suggestions that may either clarify my problem or
help me resolve it.
Please reply to me and to the list as I am not currently subscribed.
Thanks in advance
Alex Helbig.
-------------------------------------------------
Alex Helbig
Head of IT Services
Redeemer Lutheran College
745 Rochedale Rd
Rochedale Q 4123
Australia
Ph: +61 7 3341 4555
Fax: +61 7 3341 9143
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