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Subjectksoftirqd_CPU0 causing severe latency
I am running a RH7.2 router with kernel 2.4.18-19.7.x and upgraded from 
2.4.18-17 in hopes this would fix the problem, but it hasn't.

The problem I am experiencing is that after a while, the system begins to
lag badly, and running "ps -ax" writes to a SSH console like a terminal
running at 14.4kbps. This only seems to have occurred after the box
started procesing a network load.

The box is a router, with a Supermicro (model=?) motherboard with embedded
Intel EEpro/100 NICs using the eepro100 module. This box is also serving
as an iptables filter for the network as well. It's processing
approximately 60Mbps sustained traffic outbound, and about 10-15Mbps
traffic inbound.

The box also lags SEVERLY when I'm trying to use the state matching in the
kernel (as module), lagging badly when ip_conntrack is loaded.


In contrast, I am running the same OS and kernel versions on another box
(same modules) and am not having the same problem (it is only handling
about 5Mbps sustained out, and 1Mbps sustained inbound).

I need HELP!


Here are the specs on the troubled system:
Intel P3-1.0GHz, 512MB RAM, 2x Intel EEPro/100 (eepro100 module)
Dual CPU board, w/o 2nd CPU, running non-smp kernel (uniprocessor kernel).

Module List (system runnin at its best):
Module Size Used by Not tainted
cls_route 5056 0 (unused)
cls_u32 5764 1
cls_fw 3264 0 (unused)
sch_prio 3552 0 (unused)
sch_sfq 4512 0 (unused)
sch_tbf 3264 2
sch_cbq 14080 1
autofs 11172 0 (autoclean) (unused)
eepro100 20240 2
ipt_REJECT 3744 22 (autoclean)
iptable_filter 2464 1 (autoclean)
ip_tables 13696 2 [ipt_REJECT iptable_filter]
ext3 64768 5
jbd 47892 5 [ext3]

PID TTY STAT TIME COMMAND
1 ? S 1:43 init [3]
2 ? SW 0:00 [keventd]
3 ? SW 2:17 [kapmd]
4 ? RWN 506:27 [ksoftirqd_CPU0]
5 ? SW 1:34 [kswapd]
6 ? SW 0:00 [bdflush]
7 ? SW 0:31 [kupdated]
8 ? SW 0:00 [mdrecoveryd]
12 ? SW 0:56 [kjournald]
134 ? SW 0:00 [kjournald]
135 ? SW 0:00 [kjournald]
136 ? SW 0:47 [kjournald]
137 ? SW 0:27 [kjournald]
598 ? S 0:21 syslogd -m 0
603 ? S 0:01 klogd -2
641 ? SL 7:34 ntpd -U ntp
695 ? S 0:49 /usr/sbin/snmpd -s -l /dev/null -P
/var/run/snmpd -a
713 ? S 0:07 /usr/sbin/sshd
746 ? S 0:00 xinetd -stayalive -reuse -pidfile
/var/run/xinetd.pid

787 ? S 0:15 crond
823 ? S 0:00 /usr/sbin/atd
829 ? S 0:00 /etc/bkupexec/agent.be -c
/etc/bkupexec/agent.cfg
843 ? SN 2:01 /etc/bkupexec/agent.be -c
/etc/bkupexec/agent.cfg
850 ? S 0:16 rhnsd --interval 120
891 ? S 2:24 /usr/bin/perl /usr/libexec/webmin/miniserv.pl
/etc/we

895 tty1 S 0:00 /sbin/mingetty tty1
896 tty2 S 0:00 /sbin/mingetty tty2
897 tty3 S 0:00 /sbin/mingetty tty3
898 tty4 S 0:00 /sbin/mingetty tty4
899 tty5 S 0:00 /sbin/mingetty tty5
900 tty6 S 0:00 /sbin/mingetty tty6
5409 ? S 1:42 /usr/sbin/sshd
5410 pts/0 S 0:22 -bash
5552 ? S 0:11 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5558 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5559 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5560 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5561 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5562 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5563 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5564 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5565 ? S 0:00 /usr/sbin/httpd -DHAVE_ACCESS -DHAVE_PROXY
-DHAVE_AUT

5653 pts/0 R 0:01 ps -ax


4:23pm up 1 day, 22:33, 1 user, load average: 0.66, 0.73, 0.81
43 processes: 41 sleeping, 2 running, 0 zombie, 0 stopped
CPU states: 1.3% user, 1.3% system, 0.0% nice, 20.4% idle
Mem: 513032K av, 183252K used, 329780K free, 0K shrd, 105560K
buff
Swap: 257000K av, 0K used, 257000K free 47172K
cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
5655 root 19 0 1028 1024 824 R 33.6 0.1 0:01 top
4 root 35 19 0 0 0 RWN 18.8 0.0 506:40
ksoftirqd_CPU0
641 ntp 15 0 1932 1932 1732 S 0.6 0.3 7:35 ntpd
1 root 15 0 508 508 440 S 0.0 0.0 1:43 init
2 root 15 0 0 0 0 SW 0.0 0.0 0:00 keventd
3 root 15 0 0 0 0 SW 0.0 0.0 2:17 kapmd
5 root 15 0 0 0 0 SW 0.0 0.0 1:34 kswapd
6 root 25 0 0 0 0 SW 0.0 0.0 0:00 bdflush
7 root 15 0 0 0 0 SW 0.0 0.0 0:31 kupdated
8 root 25 0 0 0 0 SW 0.0 0.0 0:00 mdrecoveryd
12 root 15 0 0 0 0 SW 0.0 0.0 0:56 kjournald
134 root 15 0 0 0 0 SW 0.0 0.0 0:00 kjournald
135 root 15 0 0 0 0 SW 0.0 0.0 0:00 kjournald
136 root 15 0 0 0 0 SW 0.0 0.0 0:47 kjournald
137 root 16 0 0 0 0 SW 0.0 0.0 0:27 kjournald
598 root 15 0 612 612 516 S 0.0 0.1 0:21 syslogd
603 root 15 0 1208 1208 448 S 0.0 0.2 0:01 klogd
695 root 16 0 2940 2940 1844 S 0.0 0.5 0:49 snmpd




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