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Enthusiast

C6500 high CPU

Hi,

My C6500 is having relatively high CPU (no spikes, but constantly)

switch#sh proc cpu

CPU utilization for five seconds: 40%/39%; one minute: 51%; five minutes: 49%

I'm under the impression that cef is causing this problem because alot of packets are being processed or send to/from the CPU.

switch#sh ibc brief

Interface information:

        Interface IBC0/0(idb 0x509B72DC)

        Hardware is Mistral IBC (revision 5)

        5 minute rx rate 141710000 bits/sec, 67364 packets/sec

        5 minute tx rate 141709000 bits/sec, 67361 packets/sec

        34311544953 packets input, 7371821604651 bytes

        0 broadcasts received

        34309743009 packets output, 7371940709940 bytes

        146469 broadcasts sent

        3 Inband input packet drops

        0 Bridge Packet loopback drops

        0 Rx packets dropped with Multicast MAC and Unicast IP

        4130938799 Packets CEF Switched, 0 Packets Fast Switched

        0 Packets SLB Switched, 0 Packets CWAN Switched

        Potential/Actual paks copied to process level 114092578/114092578 (0 dropped, 0 spd drops)

        2313463186 inband interrupts

        3671491 transmit ring cleanups

        2319330986 ibl inputs

        3671491 total tx interrupts set

            3584042 tx ints due to packets outstanding

            87449 tx ints due low free buffers in pool

            0 tx ints due to application setting

        tx dma done batch size=32

        buffers free minimum before tx int=4

        mistral ran out of tx descriptors 0 times

        mistral tx interrupt inconsisteny occured 0 times

        Label switched pkts dropped: 0

        Xconnect pkts processed: 0, dropped: 0

        IBC resets   = 2; last at 12:30:36.892 UTC Mon Sep 12 2011

MISTRAL ERROR COUNTERS

        System address timeouts  = 0     BUS errors     = 0

        IBC Address timeouts     = 0 (addr 0x0)

        Page CRC errors          = 0     IBL CRC errors = 0

        ECC Correctable errors   = 0

        Packets with padding removed (0/0/0)   = 0

        Packets expanded (0/0)   = 0

        Packets attempted tail end expansion > 1 page and were dropped = 0

        IP packets dropped with frag offset of 1 = 0

        0 total packets dropped on throttled interfaces (0 low, 0 medium, 0 high)

        0 packets corrected for if_input

        0 packets were uncorrectable for if_input

        Hazard Illegal packet length     = 0     Illegal Offset       = 0

        Hazard Packet underflow          = 0     Packet Overflow      = 0

        IBL fill hang count              = 0     Unencapsed packets   = 0

        LBIC RXQ Drop pkt count = 0            LBIC drop pkt count  = 0

        LBIC Drop pkt stick     = 0

switch#

switch#sh ip cef switching statistics

       Reason                          Drop       Punt  Punt2Host

RP LES Packet destined for us             0    4207971          0

RP LES No adjacency                   17162          0          0

RP LES Incomplete adjacency              15          0          0

RP LES TTL expired                        0          0  106925413

RP LES Features                       87222          0          0

RP LES Neighbor resolution req      2215100        248          0

RP LES Total                        2319499    4208219  106925413

All    Total                        2319499    4208219  106925413

switch#

I did a netdr and I can see that the majority of packets going to the CPU are packets for which I have an entry in the CEF table.

What can be a reason why those packets don't get hardware switches?

I'm running Version 12.2(33)SXH5 - Sup720-10G

If any more output is required, just ask.

Thanks alot!

Everyone's tags (4)
4 REPLIES 4
Rising star

C6500 high CPU

Please show us:

show processes cpu sorted

Enthusiast

Re: C6500 high CPU

Hi,

I filtered out all 0.00% processes:

switch#sh proc cpu sorted | ex 0.00

CPU utilization for five seconds: 53%/51%; one minute: 45%; five minutes: 44%

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process

  31        1204       620       1941  1.35%  0.59%  0.18%   1 SSH Process

303     6074464  35323285        171  0.55%  0.27%  0.28%   0 Port manager per

146     5859992  92983981         63  0.31%  0.08%  0.12%   0 IP Input

switch#

Thanks,

Dario

Enthusiast

C6500 high CPU

Anybody who has a clue where to start digging?

Contributor

C6500 high CPU

is the number of ttl expired packet moving.

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