From: Dreams Ruan (dreams_r@xxxxxxx)
Date: Fri Dec 28 2001 - 22:18:32 GMT-3
Chuck Church:
I think I finded the answer.I use flow cache switching in interface,and
the result tell me that average 64 bytes per packet.That router use route
VOIP packet to others.When use G.729,the IP packet is 50 bytes,and the router
use frame relay encapsulation in lease line.So,the CPU use more cycle to
process packet encapsulation.I think change from FR to HDLC will improve
cpu utilization,or change FR fragment from 53 bytes(default) to 1600 bytes.
But I don't know the FR switching(carrier) support or not.
!!!!
>Dreams,
>
> The ratio of fast to process switched packets looks real good. But if
>you do the math, your 1.1 mb/sec and 2800 pps traffic gives you an average
>of 49 bytes per packet. This looks like a DOS to me. They're probably all
>TCP SYNC packets. Is this an Internet router? If so, throw the firewall
>feature set on the router. I think it's got the same memory requirements as
>plain IP for the 2600s. Log everything, and see if you get any messages
>about too many half-open connections. You should find the culprit then. It
>could even be internal, if you're running (sadly) M$'s IIS.
>
>Hope this helps,
>Chuck
>
>----- Original Message -----
>From: "Dreams Ruan" <dreams_r@163.com>
>To: "Chuck Church" <cchurch@optonline.net>
>Cc: <ccielab@groupstudy.com>
>Sent: Friday, December 28, 2001 4:50 AM
>Subject: Re: Re: Re: OT:Why so high CPU utilization
>
>
>> Chuck Church,
>>
>> The router's config is easy and simple,so I can put the "show interface
>> switching" like :
>>
>> Router#sh int ser 0 switching
>> Serial0
>> Throttle count 0
>> Drops RP 0 SP 0
>> SPD Flushes Fast 0 SSE 0
>> SPD Aggress Fast 0
>> SPD Priority Inputs 2251 Drops 0
>>
>> Protocol Path Pkts In Chars In Pkts Out Chars Out
>> Other Process 0 0 60770 850780
>> Cache misses 0
>> Fast 0 0 0 0
>> Auton/SSE 0 0 0 0
>> IP Process 68382 5638639 40984 5556171
>> Cache misses 0
>> Fast 1303619723 909626948 1364827571 1390802000
>> Auton/SSE 0 0 0 0
>> !!!!
>>
>> FastEthernet0
>> Throttle count 0
>> Drops RP 0 SP 0
>> SPD Flushes Fast 0 SSE 0
>> SPD Aggress Fast 0
>> SPD Priority Inputs 0 Drops 0
>>
>> Protocol Path Pkts In Chars In Pkts Out Chars Out
>> Other Process 17306 2429410 60877 3652620
>> Cache misses 0
>> Fast 0 0 0 0
>> Auton/SSE 0 0 0 0
>> IP Process 72976 12178629 8009 1169388
>> Cache misses 0
>> Fast 1442001452 3879802872 1303593865 1703437314
>> Auton/SSE 0 0 0 0
>> ARP Process 36674 2200440 11159 669540
>> Cache misses 0
>> Fast 0 0 0 0
>> Auton/SSE 0 0 0 0
>> CDP Process 9717 3478458 9720 3022137
>> Cache misses 0
>> Fast 0 0 0 0
>> Auton/SSE 0 0 0 0
>>
>>
Dreams Ruan
dreams_r@163.com
2001-12-29
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