03-07-2007 01:59 PM - edited 03-05-2019 02:46 PM
Dear community.
After using my cisco 2621 as my internet gateway, and upgrading my DSL connection to 20mbit/1mbit, my cpu usage has increased to almost 90%. These 90% are reached when i am downloading @ 15mbit/sec.
After issueing a 'show proc cpu sorted' command, the 80% cpu usage was not caused by any process, but by interrupts:
CPU utilization for five seconds: 87%/81%; one minute: 1%; five minutes: 3%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
41 68700 76661 896 0.95% 0.19% 0.16% 0 IP Input
I am already using 'ip cef' on both the FA interfaces. And issueing a 'sh int stat' command result in a very healthy routing proces if you ask me, if you look at the cache/proces ratio:
FastEthernet0/0
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 75394 6417511 46889 5303988
Route cache 415701 36392514 645159 763558263
Total 491095 42810025 692048 768862251
FastEthernet0/1
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 16157 3375901 27213 2645817
Route cache 639952 764440471 415434 37734183
Total 656109 767816372 442647 40380000
NIDWORKR01#sh ip cef sum
IP CEF with switching (Table Version 116), flags=0x0
94 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 0
94 leaves, 127 nodes, 144864 bytes, 119 inserts, 25 invalidations
0 load sharing elements, 0 bytes, 0 references
universal per-destination load sharing algorithm, id 3EDCA274
3(0) CEF resets, 1 revisions of existing leaves
Resolution Timer: Exponential (currently 1s, peak 1s)
1 in-place/0 aborted modifications
refcounts: 32828 leaf, 32768 node
Table epoch: 0 (94 entries at this epoch)
Adjacency Table has 90 adjacencies
81 IPv4 adjacencies
I have already followed the cisco doc which mentions the 'high cpu usage caused by interrupts'. These steps did not lead to decrease my cpu usage. Can anybody point me in a direction to troubleshoot the traffic that is causing this high cpu usage? Could this problem be CEF related?
Btw, IOS version 12.3(21)
Thanks in advance!
09-06-2007 03:49 PM
If you're pushing 15 Mbps through a 2621, your CPU performance is within expectations.
A chart that's been reference within these forums, http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf, show a 262x can do about 13 Mbps using fast/cef switching.
09-08-2007 06:43 AM
Ah. Thanks for sharing this chart.
Still though, I am wondering what kind of hardware routers ISP's are using these days for the SOHO market. The standard router my ISP delivers on a 20mbit line, is a SMC 79xx router. I can't imagine these routers have better hardware built-in as Cisco does?
But, regarding this pdf, the cpu is indeed within expected ranges.
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