Skip site navigation (1)Skip section navigation (2)
Date:      Thu, 25 Apr 2002 13:36:15 -0500 (CDT)
From:      Joe Greco <jgreco@ns.sol.net>
To:        dillon@apollo.backplane.com (Matthew Dillon)
Cc:        freebsd-smp@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG
Subject:   Re: kernel trap 9 with interrupts disabled
Message-ID:  <200204251836.NAA41191@aurora.sol.net>
In-Reply-To: <200204071822.g37IMbt34515@apollo.backplane.com> from "Matthew Dillon" at Apr 07, 2002 11:22:37 AM

next in thread | previous in thread | raw e-mail | index | archive | help
>     Hmm.  Maybe adjust the code to panic the machine when this
>     situation occurs, then see if you can get a kernel dump out
>     of it.

Looks like I'll be doing that next.  Any help available from anyone in
looking at that?  I'm not big into reading kernel dumps :-)

>     As to the load issue... that sounds like a classic priority
>     inversion problem.  Check the 'nice' of all the processes in
>     the system and see if some nice'd-down processes are hogging
>     the cpu.  'ps axlww' in a big window.

Hmmm.  I did just notice something.  I run setiathome everywhere using a
little daemon that punts it down to idprio etc.  I just tried to kill them
and they didn't, and I looked again and it's because they're running at 
0.0%, so then I idprio -t -<pid>'d them, and when I did that to the first
one, my login session froze for the better part of a minute.  It remained
pingable but apparently unresponsive.  Then it recovered.  The second one
went as expected.

>     Also look at the user cpu verses system cpu percentage to see
>     where the cpu is going.

Here's top, any hints?  (note: the names have been changed to protect the
innocent) 

last pid:  3145;  load averages: 13.60, 13.97, 14.05   up 18+14:27:19  13:26:35
63 processes:  15 running, 47 sleeping, 1 stopped
CPU states:  4.5% user,  0.0% nice, 94.8% system,  0.6% interrupt,  0.0% idle
Mem: 142M Active, 656M Inact, 145M Wired, 47M Cache, 112M Buf, 14M Free
Swap: 2048M Total, 56K Used, 2048M Free

  PID USERNAME PRI NICE  SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
78128 useruser  63   0 34696K 33896K RUN    0  83:26 31.30% 31.30% nit
78596 useruser  64   0 18716K 17896K RUN    0  79:59 31.10% 31.10% nit
78959 useruser  64   0 15872K 14728K RUN    0  79:30 29.93% 29.93% nit
57493 use       63   0  6412K  5804K RUN    1 601:36 13.43% 13.43% perl
99887 useruser  63   0 14200K 10420K CPU1   1   3:26 13.09% 13.09% perl
99918 use       64   0  1060K   656K RUN    1   2:26 11.33% 11.33% funny
 2059 useruser  63   0  2220K  1424K RUN    1   0:59 11.18% 11.18% grep
  507 use       63   0  1060K   656K RUN    1   1:47  9.52%  9.52% funny
 1363 use       61   0  1060K   632K RUN    0   0:57  8.98%  8.98% funny
 2555 use       63   0  1060K   632K RUN    1   0:34  8.30%  8.30% funny
 3127 use       62   0  1060K   596K RUN    0   0:02  9.38%  6.10% funny
 1028 root       2   0   964K   572K select 1  42:59  2.73%  2.73% syslogd
 3104 use        2   0  1060K   576K sbwait 0   0:01  1.55%  1.22% funny
 2945 root      35   0  1996K  1148K CPU0   1   0:02  0.93%  0.93% top
 3106 use        2   0  1060K   656K sbwait 1   0:01  1.12%  0.88% funny
 3145 use        2   0  1060K   596K sbwait 0   0:00  9.00%  0.44% funny
99230 nobody    37  52 16556K 16424K RUN    1 182.4H  0.00%  0.00% setiathome
21867 nobody    37  52 16556K 16428K RUN    0 171.6H  0.00%  0.00% setiathome
  966 root       2   0  1648K   744K select 0   4:27  0.00%  0.00% ntpd
  945 bind       2   0  3300K  2608K select 0   2:53  0.00%  0.00% named-dns
 1047 root      10   0  1228K   848K nanslp 0   1:22  0.00%  0.00% mon
  893 root      10   0  1004K   652K nanslp 0   1:19  0.00%  0.00% cron
57483 use        2   0   896K   400K sbwait 0   1:09  0.00%  0.00% wont
  895 root       2   0  2224K  1172K select 0   0:50  0.00%  0.00% sshd
57488 use        2   0  4600K  4096K sbwait 1   0:48  0.00%  0.00% perl
57496 use        2   0   896K   504K accept 1   0:42  0.00%  0.00% mrdata
 5828 root       2   0  2308K  1688K select 1   0:24  0.00%  0.00% sshd
  950 nobody     2   0   928K   380K select 0   0:10  0.00%  0.00% identd
  887 daemon     2   0   904K   540K sbwait 0   0:07  0.00%  0.00% rwhod
72401 userus     3   0  2628K  2244K ttyin  1   0:05  0.00%  0.00% zsh
25432 root       2   0  2348K  1728K select 0   0:04  0.00%  0.00% sshd
72398 root       2   0  2308K  1412K select 0   0:03  0.00%  0.00% sshd
 2014 userxx     3   0  2792K  2304K ttyin  0   0:03  0.00%  0.00% lynx
 1676 root       2   0  2316K  1636K select 0   0:03  0.00%  0.00% sshd
25551 useruser   3   0  1484K  1068K ttyin  0   0:02  0.00%  0.00% tcsh
 2778 root      36   0  1996K  1144K STOP   0   0:02  0.00%  0.00% top
 1206 root      28   0  2308K  1632K RUN    0   0:02  0.00%  0.00% sshd
98311 useruser  10   0   640K   280K wait   0   0:01  0.00%  0.00% sh
 2777 root       2 -20  1992K  1152K select 1   0:01  0.00%  0.00% top
 1248 root      18   0  1384K   992K pause  1   0:00  0.00%  0.00% tcsh
 1679 userxx    18   0  2400K  2064K pause  1   0:00  0.00%  0.00% zsh
 1207 jgreco    18   0  1380K   992K pause  1   0:00  0.00%  0.00% tcsh
 5904 useruser   3   0  1452K  1040K ttyin  1   0:00  0.00%  0.00% tcsh
 1008 root       2   0  3320K  2156K select 1   0:00  0.00%  0.00% snmpd
99852 useruser  10   0  1028K   600K wait   0   0:00  0.00%  0.00% bash
98623 mailnull  -6   0  2524K  1780K piperd 0   0:00  0.00%  0.00% sendmail
  998 nobody    10  52   896K   492K wait   1   0:00  0.00%  0.00% setidaemon
 2768 root      10   0   628K   268K wait   1   0:00  0.00%  0.00% sh
98280 useruser  10   0   628K   268K wait   1   0:00  0.00%  0.00% sh
 2762 root      10   0   636K   276K wait   1   0:00  0.00%  0.00% sh
98293 useruser  10   0   640K   280K wait   0   0:00  0.00%  0.00% sh
99850 useruser  10   0   628K   268K wait   1   0:00  0.00%  0.00% sh
 1036 root       3   0   948K   456K ttyin  1   0:00  0.00%  0.00% getty
 1038 root       3   0   948K   456K ttyin  1   0:00  0.00%  0.00% getty
 1039 root      10   0   636K   232K wait   0   0:00  0.00%  0.00% sh

-- 
Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net
"We call it the 'one bite at the apple' rule. Give me one chance [and] then I
won't contact you again." - Direct Markenitg Ass'n position on e-mail spam(CNN)
With 24 million small businesses in the US alone, that's way too many apples.

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200204251836.NAA41191>