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287
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5
Helpful
4
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High CPU usage

suthomas1
Level 6
Level 6

Hi,

We have this 4500 switch which shows high usage at some times..when further checked the majority of usage,near 60%, is done by

this factor: Cat4k Mgmt LoPri .

Can anyone help as to why this is occuring & how to solve this further? Checked cisco site for details..but it doesnt say actually the cause.

Thanks.

4 Replies 4

dario.didio
Level 4
Level 4

How is the output for following cpu usage read?

6161616161616161616161616161616161616161616161616161616161

3432724832423443424642324242434242423332423452434542524242

100

90

80

70 * * *

60 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

50 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

40 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

30 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

20 * * * *** * * * * *** * * * * * * * * * * * * * *** * * *

10 ##########################################################

0....5....1....1....2....2....3....3....4....4....5....5....

0 5 0 5 0 5 0 5 0 5

CPU% per minute (last 60 minutes)

* = maximum CPU% # = average CPU%

__________

what do the no. on the x axis denote & how are they to be read along with the usage.Should more attention be paid on the 60 min data or the 60 seconds data for analysis?

Thanks!

The output shows the average CPU% per minute of the last 60 minutes.

X axis is the CPU%, Y axis is time.

The 2 upper rows give you the CPU percentage of that minute

6

3

means 63 CPU%

minute 1: CPU% 63

minute 2: CPU% 14

minute 3: CPU% 63

minute 4: CPU% 12

minute 5: CPU% 67

etc...

The 2 lower lines give the time

6161616161616161616161616161616161616161616161616161616161

3432724832423443424642324242434242423332423452434542524242

100

90

80

70 * * *

60 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

50 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

40 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

30 * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

20 * * * *** * * * * *** * * * * * * * * * * * * * *** * * *

10 ##########################################################

0....5....1....1....2....2....3....3....4....4....5....5....

..........0....5....0....5....0....5....0....5....0....5....

0 minutes....5minutes...10minutes....

* means the Max CPU% of that minute, # means the average CPU% of that minute.

For analis, you should take the longer period, like minutes or 5 minutes. When you take seconds, you will get a snapshot of a moment, which could lead to incorrect conclusions.

It seems you average over the period of an hour is 10% and is very stable.

HTH,

Dario

Thanks for this great info...

You say the avg use is 10% for over an hour, but if seen wrt the output each minutes it seems the usage was like 40,50 and goes upto 70% every time period here.

How could we define that?

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