I noticed on a recent RELENG_8 box, the CPU became pegged. Looking
at top, it has something to do with flowtables
last pid: 49269; load
averages: 2.76, 2.29, 2.07
up 18+09:36:04 21:42:07
89 processes: 6 running, 70 sleeping, 13 waiting
CPU: 0.0% user, 0.0% nice, 50.0% system, 0.0% interrupt, 50.0% idle
Mem: 52M Active, 1496M Inact, 172M Wired, 16K Cache, 112M Buf, 280M Free
Swap: 3072M Total, 3072M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
10 root 2 171 ki31 0K 16K RUN 0 809.5H 100.00% idle
18 root 1 44 - 0K 8K CPU0 0 117:30 100.00%
flowcleaner
as the flowcleaner is running full speed. Does anyone know what that
might be about ?
sysctl -a |grep flow
kern.sigqueue.overflow: 0
net.inet.ip.output_flowtable_size: 32768
net.inet.tcp.reass.overflows: 0
net.inet.flowtable.stats:
net.inet.flowtable.nmbflows: 50176
net.inet.flowtable.tcp_expire: 86400
net.inet.flowtable.fin_wait_expire: 600
net.inet.flowtable.udp_expire: 300
net.inet.flowtable.syn_expire: 300
net.inet.flowtable.enable: 0
net.inet.flowtable.debug: 0
net.inet6.ip6.auto_flowlabel: 1
# sysctl -a net.inet.flowtable.stats
net.inet.flowtable.stats:
table name: ipv4
collisions: 958
allocated: 0
misses: 992897
max_depth: 1
free_checks: 36419211
frees: 785503
hits: 9745703272
lookups: 9746696168
The box runs mpd5 to terminate some l2tp connections and runs ospf
and has just one area. In its releng7 incarnation, all was quite solid.
I am going to disable flowtables on this box for now, but if I see it
happen on another, what can I do to better debug it ?
---Mike
--------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike