Date: Wed, 21 May 2003 22:38:18 +0800 From: "Paul Hamilton" <paul@computerwest.com.au> To: "Freebsd-Questions" <freebsd-questions@FreeBSD.ORG> Subject: 'top' showing high interrupt rate Message-ID: <AGEHIFHGNEMPFNCPLONMOEFPEKAA.paul@compwest.com.au>
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Hi,
I noticed that top shows a rather high interrupt rate, usually hovering
around 60%! Here is a sample:-
last pid: 2879; load averages: 0.34, 0.24, 0.18
up 1+17:26:56 17:18:10
36 processes: 2 running, 33 sleeping, 1 zombie
CPU states: 0.6% user, 0.0% nice, 0.0% system, 59.8% interrupt, 39.6%
idle
Mem: 11M Active, 5072K Inact, 7988K Wired, 3552K Cache, 6480K Buf, 960K Free
Swap: 128M Total, 4608K Used, 123M Free, 3% Inuse
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU
COMMAND
135 root 10 0 980K 528K nanslp 11:38 0.00% 0.00% cron
201 root 2 0 2824K 1132K select 3:46 0.00% 0.00% ppp
108 root 2 0 452K 208K select 0:29 0.00% 0.00% natd
127 root 2 0 2760K 1704K select 0:14 0.00% 0.00% named
223 root 2 0 2068K 908K select 0:10 0.00% 0.00% sshd
212 root 2 0 2044K 876K select 0:10 0.00% 0.00% sshd
<snip>
pstat -T says:
120/1064 files
4M/127M swap space
vmstat 10 says:
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr ad0 ad1 in sy cs us sy
id
0 0 0 12992 4992 1 0 0 0 1 0 0 0 237 52 8 0 59
41
0 0 0 9404 4992 1 0 0 0 0 0 0 0 229 35 6 0 60
40
0 0 0 15572 4868 16 0 0 0 7 0 0 0 231 938 10 1 61
38
0 0 0 17820 4868 8 0 0 0 0 0 1 0 230 45 8 0 60
40
0 0 0 12492 5224 8 0 0 0 9 0 0 0 231 47 8 1 60
39
dmesg says:
Copyright (c) 1992-2000 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 4.2-RELEASE #1: Tue Feb 13 22:51:23 WST 2001
root@ant.compwest.net.au:/usr/src/sys/compile/ANT
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium/P55C (165.79-MHz 586-class CPU)
Origin = "GenuineIntel" Id = 0x544 Stepping = 4
Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
real memory = 33554432 (32768K bytes)
avail memory = 29478912 (28788K bytes)
Yes, the server only has 32MB or RAM, however, it's only using 4MB of VM.
Anyone have any idea how to troubleshoot further? How can I isolate what is
causing the rather high interrupt rate?
Cheers,
Paul Hamilton
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