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6500 High CPU Utilization

Hi,

We have a problem with a 6506-E which is having a high CPU utilization.

Here's the output from the show proc cpu:

6506_A#sh proc cpu

CPU utilization for five seconds: 79%; one minute: 81%; five minutes: 78%

PID 5Sec 1Min 5Min Process

1 0.1% 1.2% 1.4% kernel

3 0.0% 0.0% 0.0% qdelogger

4 0.0% 0.0% 0.0% devc-pty

5 0.0% 0.0% 0.0% devc-mistral.proc

6 0.0% 0.0% 0.0% pipe

7 0.0% 0.0% 0.0% dumper.proc

4104 0.0% 0.0% 0.0% bflash_driver.proc

12297 0.0% 0.0% 0.0% pcmcia_driver.proc

12298 0.0% 0.0% 0.0% mqueue

12299 0.0% 0.0% 0.0% flashfs_hes.proc

12300 0.0% 0.0% 0.0% dfs_bootdisk.proc

12301 0.0% 0.0% 0.0% ldcache.proc

12302 0.0% 0.0% 0.0% watchdog.proc

12303 0.0% 0.0% 0.0% syslogd.proc

12304 0.0% 0.0% 0.0% name_svr.proc

12305 0.0% 0.1% 0.1% wdsysmon.proc

12306 0.0% 0.0% 0.0% sysmgr.proc

16386 0.0% 0.0% 0.0% chkptd.proc

16403 0.0% 0.0% 0.0% sysmgr.proc

16404 0.0% 0.0% 0.0% syslog_dev.proc

16405 0.0% 0.0% 0.0% itrace_exec.proc

--More-- PID 5Sec 1Min 5Min Process

16406 0.0% 0.0% 0.0% packet.proc

16407 0.0% 0.0% 0.0% installer.proc

16408 75.3% 75.6% 72.7% ios-base

16409 0.0% 0.0% 0.0% fh_fd_rf.proc

16410 0.0% 0.0% 0.0% fh_fd_oir.proc

16411 0.0% 0.0% 0.0% fh_metric_dir.proc

16412 0.0% 0.0% 0.0% fh_fd_snmp.proc

16413 0.0% 0.0% 0.0% fh_fd_none.proc

16414 0.0% 0.0% 0.0% fh_fd_intf.proc

16415 0.0% 0.0% 0.0% fh_fd_counter.proc

16416 0.0% 0.0% 0.0% fh_fd_gold.proc

16417 0.0% 0.0% 0.0% fh_fd_cli.proc

16418 0.0% 0.0% 0.0% fh_fd_timer.proc

16419 0.0% 0.0% 0.0% fh_fd_ioswd.proc

16420 0.0% 0.0% 0.0% fh_server.proc

16421 0.0% 0.0% 0.0% fh_policy_dir.proc

16422 0.0% 0.0% 0.0% ipfs_daemon.proc

16423 0.1% 0.4% 0.4% raw_ip.proc

16424 0.0% 0.0% 0.0% inetd.proc

16425 0.0% 0.1% 0.1% tcp.proc

16426 1.6% 1.7% 1.4% udp.proc

16427 0.6% 0.7% 0.7% iprouting.iosproc

16428 0.1% 0.2% 0.1% cdp2.iosproc

6506_A#

We searched this output in the Output Interpreter and it indicated that it could be an IOS bug. Its IOS is 12.2(18)SXF11.

Hope someone has an idea on this.

Thanks.

2 REPLIES

Re: 6500 High CPU Utilization

Yes, please update the IOS.

What engine are you using?

Re: 6500 High CPU Utilization

We had exactly the same issue and I thought it was a bug as well but it turned out to be something broadcasting and was overwhelming the CPU. I worked with TAC and here are some of the steps they had me do....

Troubleshooting steps:

1) Issue the following commands to identify utilization issue:

- "sh proc cpu | e 0.00" <- do this every 30 seconds for a couple minutes

- "sh proc cpu history" <- you're looking at the '#' symbols over the course of the last hour and last 72 hours

- "sh log" <- check for links flapping and error messages

2) Issue the following commands to identify kinds of traffic being sent to Route Processor (CPU) for software switching instead of hardware switching:

- "show interface | inc line|size/max/drop|minute" <- look for interfaces with odd input queue behavior and large number of output drops

After identifying one or two interfaces, issue the following command to see what's waiting in the buffers to be punted to the CPU. Look for patter, specifically make note of:

1) Source IP Address

2) Destination IP Address

3) TTL (e.g. TTL=1)

- "show buffer input-interface [vlan/interface] packet"

- "show buffer input-interface [vlan/interface] header"

Reference Link for 6500 High CPU Utilization Troubleshooting:

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00804916e0.shtml

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