2811 ISR High CPU, HQF Shaper Backg is suspect
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09-20-2010 12:12 PM - edited 03-06-2019 01:05 PM
Also - does anyone understand why the individual proc percents do not add up to the total CPU utilization figure? Do tell!
c2811-1#sho proc cpu
CPU utilization for five seconds: 53%/50%; one minute: 54%; five minutes: 52%
180 121888 51382361 2 1.35% 1.43% 1.34% 0 HQF Shaper Backg
115 321248 307382 1045 1.19% 0.72% 0.85% 0 IP Input
41 21564 207381 103 0.15% 0.15% 0.15% 0 Per-Second Jobs
2 8120 41499 195 0.07% 0.19% 0.16% 0 Load Meter
342 156972 118980 1319 0.07% 0.12% 0.14% 0 SCCP Application
90 267688 207205 1291 0.07% 0.12% 0.13% 0 tCOUNTER
190 14908 56070 265 0.07% 0.10% 0.12% 0 FW DP Inspect pr
327 9512 404794 23 0.07% 0.08% 0.07% 0 IP NAT Ager
181 14652 2069324 7 0.07% 0.07% 0.07% 0 RBSCP Background
126 6276 254228 24 0.07% 0.03% 0.02% 0 Spanning Tree
64 5752 828956 6 0.07% 0.02% 0.00% 0 Netclock Backgro
50 2116 41496 50 0.07% 0.01% 0.00% 0 Compute load avg
153 2596 38679 67 0.07% 0.01% 0.00% 0 TCP Timer
109 2048 28821 71 0.07% 0.00% 0.00% 0 CDP Protocol
188 2492 404687 6 0.07% 0.00% 0.00% 0 Inspect process
332 1792 25084 71 0.07% 0.00% 0.00% 0 IP SLA Mon Sync
230 1236 83 14891 0.00% 0.31% 0.08% 514 SSH Process
5 387280 28658 13513 0.00% 0.16% 0.17% 0 Check heaps
51 105612 3472 30418 0.00% 0.07% 0.05% 0 Per-minute Jobs
317 398956 2439 163573 0.00% 0.05% 0.06% 0 CCSIP_SPI_CONTRO
349 9776 829031 11 0.00% 0.04% 0.03% 0 MLD
339 16228 64851 250 0.00% 0.03% 0.05% 0 NAT MIB Helper
258 7220 1036363 6 0.00% 0.03% 0.02% 0 Atheros LED Ctro
19 43352 124032 349 0.00% 0.01% 0.00% 0 ARP Input
122 904 239 3782 0.00% 0.01% 0.00% 0 AFW_application_
147 3716 318911 11 0.00% 0.01% 0.00% 0 CEF: IPv4 proces
1 392 428 915 0.00% 0.00% 0.00% 0 Chunk Manager
3 0 5 0 0.00% 0.00% 0.00% 0 Collection proce
4 0 1 0 0.00% 0.00% 0.00% 0 EDDRI_MAIN
6 40 22 1818 0.00% 0.00% 0.00% 0 Pool Manager
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09-20-2010 02:03 PM
The output of show process cpu is a little cryptic. For the five second field it is split into two total/interrupt the difference is what we see used for processes. In this case it is 53/50 so the processes should account for about 3%(not super accurate but close)
As for interrupts this is typically packet forwarding. There are other things that might fall under interrupt like alignment errors. You can perform show align to see if there are any incrementing. For more information see the following link.
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a70f2.shtml
HQF shaper backg is QOS shaping. It is probably not high enough to worry about given the 1% it is using.
Hopefully that explains it. If you feel this is higher than it should be please check out the performance information in the following document from Miercom.
http://www.miercom.com/dl.html?fid=20061201&type=report
Regards
David Aicher
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10-18-2010 04:56 PM
If I remove all of the 0.0 utilization PIDs - note that the only ones left are near 1%. Yes they don't
nearly add up to 24% total. Any idea how that math works out? It would seem to me that here in
this snapshot that HQF shaper 1.67 really means a higher percent of CPU than 1.67 percent.
sfo-c2811-1#sho proc cpu | exc 0.0
CPU utilization for five seconds: 24%/19%; one minute: 24%; five minutes: 23%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
5 10660 653 16324 1.03% 0.24% 0.18% 0 Check heaps
115 65640 29008 2262 0.23% 1.39% 0.86% 0 IP Input
180 19504 1058750 18 1.67% 1.57% 1.53% 0 HQF Shaper Backg
343 5504 3578 1538 0.23% 0.21% 0.16% 0 SCCP Application
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10-18-2010 07:07 PM
CPU utilization for five seconds: 24%/19%; one minute: 24%; five minutes: 23%
24%/19% means 24% is overall CPU utilization, of which 19% is due to interrupts, meaning that 5% is utilized by processes
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10-19-2010 03:07 PM
Thank you. That clarifies a lot!
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10-19-2010 11:11 AM
So that raises the question what would cause the interrupt portion of CPU utilization to go so high? Here it looks like
processes are only taking up 4% yet the router is at 58% utilization. Thank you.
sfo-c2811-1#sho proc cpu
CPU utilization for five seconds: 58%/54%; one minute: 47%; five minutes: 46%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
1 332 259 1281 0.00% 0.00% 0.00% 0 Chunk Manager
2 12416 14027 885 0.07% 0.08% 0.14% 0 Load Meter
3 4652 1054 4413 0.00% 0.02% 0.00% 0 AFW_application_
4 0 1 0 0.00% 0.00% 0.00% 0 EDDRI_MAIN
5 156908 10102 15532 0.00% 0.21% 0.18% 0 Check heaps
6 64 25 2560 0.00% 0.00% 0.00% 0 Pool Manager
7 0 2 0 0.00% 0.00% 0.00% 0 Timers
8 0 1 0 0.00% 0.00% 0.00% 0 License Client N
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10-19-2010 11:39 AM
Interrupt level CPU is typically packet forwarding. As long as the CPU is not sustained near 100% it shouldn't cause an issue. If you think it is higher than you expect it to be or you are planning on adding capicity then you may want to check on performance specs.
Here is a link to some third party testing.
http://www.miercom.com/dl.html?fid=20061201&type=report
Regards
Dave Aicher
