[nsp] output buffers swapped out?

[Oliver Boehmer (oboehmer)]

Hi Tim,

Output buffers swapped out is a feature of the RSP-based Cisco 7xxx
systems. If the outbound interface transmit queue is full, then the
packet is copied from a hardware buffer to DRAM, then copied back to the
transmit queue when there is room. You can influence this behaviour
using the interface command "[no] transmit-buffers backing-store". It is
enabled by default on interfaces that use some sort of fancy queuing
(wfq in your case).

	oli

> -----Original Message-----
> From: Bulger, Tim [mailto:TBulger at ea.com] 
> Sent: Donnerstag, 9. Januar 2003 22:35
> To: cisco-nsp
> Subject: [nsp] output buffers swapped out?
> 
> 
> I have a point to point T1 that is trickling CRC errors and 
> the 'output
> buffers swapped out' counter is incrementing about once every two
> seconds.  I can't find anything on the Cisco site that explains this
> counter.  Can anyone provide any info?
> 
> Thanks,
> Tim
> 
> 
> Serial5/0 is up, line protocol is up 
>   Hardware is cxBus Serial
>   Description: T1 to UK - for vidcon only
>   Internet address is 10.14.1.29/30
>   MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec, rely 255/255, 
> load 1/255
>   Encapsulation HDLC, loopback not set, keepalive set (10 sec)
>   Last input 00:00:03, output 00:00:02, output hang never
>   Last clearing of "show interface" counters 03:45:26
>   Input queue: 0/75/0 (size/max/drops); Total output drops: 0
>   Queueing strategy: weighted fair
>   Output queue: 0/64/0 (size/threshold/drops) 
>      Conversations  0/122 (active/max active)
>      Reserved Conversations 0/0 (allocated/max allocated)
>   5 minute input rate 5000 bits/sec, 5 packets/sec
>   5 minute output rate 0 bits/sec, 0 packets/sec
>      465940 packets input, 159310829 bytes, 0 no buffer
>      Received 0 broadcasts, 0 runts, 0 giants
>      71 input errors, 71 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
>      321799 packets output, 123602921 bytes, 0 underruns
>      0 output errors, 0 collisions, 0 interface resets
>      0 output buffer failures, 689 output buffers swapped out
>      0 carrier transitions
>      RTS up, CTS up, DTR up, DCD up, DSR up
> 
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