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High load average on Linux Server running asterisk Question
we are running CentOS ans Asterisk on Dual Proc 3.0 GHZ machine , we are currently experiencing system slow downs. Is this cause of High Load average?
top - 10:26:58 up 20:55, 5 users, load average: 21.88, 17.62, 15.70
Tasks: 112 total, 3 running, 109 sleeping, 0 stopped, 0 zombie
Cpu0 : 7.9% us, 27.8% sy, 0.0% ni, 21.2% id, 0.3% wa, 5.6% hi, 37.1% si
Cpu1 : 25.2% us, 50.2% sy, 0.0% ni, 15.9% id, 4.7% wa, 0.0% hi, 4.0% si
Cpu2 : 23.8% us, 51.5% sy, 0.0% ni, 15.5% id, 5.6% wa, 0.0% hi, 3.6% si
Cpu3 : 25.6% us, 51.5% sy, 0.0% ni, 13.3% id, 7.3% wa, 0.0% hi, 2.3% si
Mem: 4150376k total, 4098092k used, 52284k free, 38780k buffers
Swap: 2031608k total, 144k used, 2031464k free, 3878640k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2410 root 15 0 0 0 0 S 22.9 0.0 28:00.12 nfsd
2414 root 15 0 0 0 0 S 18.3 0.0 25:21.99 nfsd
2236 root 16 0 133m 58m 5180 R 5.3 1.5 9:29.85 asterisk
16479 root 16 0 4088 2480 704 S 2.7 0.1 0:17.84 mtr
32571 root 16 0 4736 2480 700 R 2.3 0.1 1:00.57 mtr
18208 root 16 0 3556 968 756 S 0.7 0.0 0:02.54 top
8 root RT 0 0 0 0 S 0.3 0.0 0:00.78 migration/3
238 root 15 0 0 0 0 S 0.3 0.0 1:03.68 kjournald
7693 root 16 0 2500 968 756 S 0.3 0.0 0:11.39 top
24805 root 16 0 0 0 0 S 0.3 0.0 0:03.79 pdflush
15902 errien 15 0 7404 2208 1800 S 0.3 0.1 0:02.09 sshd
4751 root 17 0 2772 972 756 R 0.3 0.0 0:00.12 top
1 root 16 0 3324 560 480 S 0.0 0.0 0:01.14 init
2 root RT 0 0 0 0 S 0.0 0.0 0:02.67 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:06.18 ksoftirqd/0
4 root RT 0 0 0 0 S 0.0 0.0 0:00.82 migration/1
5 root 34 19 0 0 0 S 0.0 0.0 0:00.13 ksoftirqd/1
6 root RT 0 0 0 0 S 0.0 0.0 0:01.39 migration/2
7 root 34 19 0 0 0 S 0.0 0.0 0:00.54 ksoftirqd/2
9 root 34 19 0 0 0 S 0.0 0.0 0:00.72 ksoftirqd/3
10 root 5 -10 0 0 0 S 0.0 0.0 0:00.45 events/0
11 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/1
12 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/2
13 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/3
14 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 khelper
15 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid
48 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
49 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/1
50 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/2
51 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/3
64 root 12 -10 0 0 0 S 0.0 0.0 0:00.00 aio/0
65 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/1
66 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/2
67 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/3
top - 10:26:58 up 20:55, 5 users, load average: 21.88, 17.62, 15.70
Tasks: 112 total, 3 running, 109 sleeping, 0 stopped, 0 zombie
Cpu0 : 7.9% us, 27.8% sy, 0.0% ni, 21.2% id, 0.3% wa, 5.6% hi, 37.1% si
Cpu1 : 25.2% us, 50.2% sy, 0.0% ni, 15.9% id, 4.7% wa, 0.0% hi, 4.0% si
Cpu2 : 23.8% us, 51.5% sy, 0.0% ni, 15.5% id, 5.6% wa, 0.0% hi, 3.6% si
Cpu3 : 25.6% us, 51.5% sy, 0.0% ni, 13.3% id, 7.3% wa, 0.0% hi, 2.3% si
Mem: 4150376k total, 4098092k used, 52284k free, 38780k buffers
Swap: 2031608k total, 144k used, 2031464k free, 3878640k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2410 root 15 0 0 0 0 S 22.9 0.0 28:00.12 nfsd
2414 root 15 0 0 0 0 S 18.3 0.0 25:21.99 nfsd
2236 root 16 0 133m 58m 5180 R 5.3 1.5 9:29.85 asterisk
16479 root 16 0 4088 2480 704 S 2.7 0.1 0:17.84 mtr
32571 root 16 0 4736 2480 700 R 2.3 0.1 1:00.57 mtr
18208 root 16 0 3556 968 756 S 0.7 0.0 0:02.54 top
8 root RT 0 0 0 0 S 0.3 0.0 0:00.78 migration/3
238 root 15 0 0 0 0 S 0.3 0.0 1:03.68 kjournald
7693 root 16 0 2500 968 756 S 0.3 0.0 0:11.39 top
24805 root 16 0 0 0 0 S 0.3 0.0 0:03.79 pdflush
15902 errien 15 0 7404 2208 1800 S 0.3 0.1 0:02.09 sshd
4751 root 17 0 2772 972 756 R 0.3 0.0 0:00.12 top
1 root 16 0 3324 560 480 S 0.0 0.0 0:01.14 init
2 root RT 0 0 0 0 S 0.0 0.0 0:02.67 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:06.18 ksoftirqd/0
4 root RT 0 0 0 0 S 0.0 0.0 0:00.82 migration/1
5 root 34 19 0 0 0 S 0.0 0.0 0:00.13 ksoftirqd/1
6 root RT 0 0 0 0 S 0.0 0.0 0:01.39 migration/2
7 root 34 19 0 0 0 S 0.0 0.0 0:00.54 ksoftirqd/2
9 root 34 19 0 0 0 S 0.0 0.0 0:00.72 ksoftirqd/3
10 root 5 -10 0 0 0 S 0.0 0.0 0:00.45 events/0
11 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/1
12 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/2
13 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 events/3
14 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 khelper
15 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 kacpid
48 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
49 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/1
50 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/2
51 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 kblockd/3
64 root 12 -10 0 0 0 S 0.0 0.0 0:00.00 aio/0
65 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/1
66 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/2
67 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 aio/3
Last Comment
ASKER
there are no telephony cards installed. this is a pure voip solution, we are using SIP. there is also no transcoding all calls are g.711
ASKER
I guess my real question is with the load average of 10 to 20 does this pose a problem to me or not?
Load average by definition is the number of processes waiting for execution. A long term average of 15 does seem very high. Our Asterisk installation is close to 0.0 but has no simultaneous calls most of the time. Normally for example a load average over 8 would cause a mail server to stop accepting connections. Therefore I think there is something wrong.
nfsd is using about 40% of the cpu. Part of the system resource could be being used by the associated disk activity. Are you using nfs heavily?
nfsd is using about 40% of the cpu. Part of the system resource could be being used by the associated disk activity. Are you using nfs heavily?
ASKER
Yes we are using nsf moderately i guess, we do around 100 simultaneous calls. Can i assume that at load average of 10 to 20, there can be potential problems with the asterisk even if the CPU utilization is only 50% at max.
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My guess is that there is an IRQ problem. There is a brief troubleshooting guide at http://www.voip-info.org/wiki/view/Asterisk+PCI+bus+Troubleshooting
What telephony (E1/T1, FXO/FXS etc...) cards do you have installed?
On the command line toy can type 'lspci -v' to show the cards fitted and the IRQ settings etc...