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Cisco 3550-24 failed to create VeryBig Buffers

I have a Cisco 3550-24 running eigrp. it uplinked to two 6513 router/switches and downlinked to 5 2960/2950's. the users complained slowness. 

 

I checked the 3550 and show buffers as below:

 

BAY3500-BSMNT#sh buffers
Buffer elements:
     483 in free list (500 max allowed)
     311732715 hits, 0 misses, 0 created

Public buffer pools:
Small buffers, 104 bytes (total 50, permanent 50, peak 56 @ 7w0d):
     49 in free list (20 min, 150 max allowed)
     124358965 hits, 2 misses, 6 trims, 6 created
     0 failures (0 no memory)
Middle buffers, 600 bytes (total 25, permanent 25, peak 40 @ 7w0d):
     24 in free list (10 min, 150 max allowed)
     808186 hits, 6 misses, 18 trims, 18 created
     0 failures (0 no memory)
Big buffers, 1524 bytes (total 143, permanent 128, peak 160 @ 7w0d):
     137 in free list (128 min, 512 max allowed)
     64625250 hits, 16052 misses, 47747 trims, 47762 created
     0 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 0, permanent 0, peak 5 @ 5d13h):
     0 in free list (0 min, 0 max allowed)
     3293074 hits, 3530622 misses, 7061244 trims, 7061244 created
     0 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 0 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)
Huge buffers, 18024 bytes (total 0, permanent 0):
     0 in free list (0 min, 0 max allowed)
     0 hits, 0 misses, 0 trims, 0 created
     0 failures (0 no memory)

Hits, misses, trims, and created  for VeryBig buffers are incrementing fast. it looked the system failed to create VeryBig buffers or it was incapable of doing so.

 

can something shine some light?

here is show ver:

BAY3500-BSMNT#sh ver
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(11)EA1, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Wed 28-Aug-02 10:03 by antonino
Image text-base: 0x00003000, data-base: 0x0071D658

ROM: Bootstrap program is C3550 boot loader

BAY3500-BSMNT uptime is 47 weeks, 2 days, 1 hour, 56 minutes
System returned to ROM by power-on
System restarted at 10:02:07 edt Sat Jun 7 2014
System image file is "flash:/c3550-i5q3l2-mz.121-11.EA1/c3550-i5q3l2-mz.121-11.EA1.bin"

cisco WS-C3550-24 (PowerPC) processor (revision G0) with 65526K/8192K bytes of memory.
Processor board ID CHK0643W1CW
Last reset from warm-reset
Bridging software.
Running Layer2/3 Switching Image

Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 1 Gigabit Ethernet/IEEE 802.3 interface

Ethernet-controller 4 has 1 Gigabit Ethernet/IEEE 802.3 interface

24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is enabled.
384K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:0B:46:EA:46:80
Motherboard assembly number: 73-5700-09
Power supply part number: 34-0966-02
Motherboard serial number: CAT064302U0
Power supply serial number: DCA0638126F
Model revision number: G0
Motherboard revision number: A0
Model number: WS-C3550-24-EMI
System serial number: CHK0643W1CW
Configuration register is 0x10F

 

 

thanks,

Alison

 

 

 

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