buffer allocation

o.hassairi · ‎09-12-2006

hello

i found missed buffers for big paquets

Big buffers, 1536 bytes (total 1, permanent 0, peak 4 @ 00:20:55):

1 in free list (0 min, 0 max allowed)

8631 hits, 607 misses, 9293 trims, 9294 created

0 failures (0 no memory)

as you can see inspite of 8631 hits there is 0 permanent.

so i think we should increase the amount of big buffers using the command: buffer big permanent xxx.

but how to estimate the xxx ?

mchin345 · ‎09-19-2006

Permanent buffers are used to accommodate the normal buffer requirements (including frequent bursts) of the router. Determination of the normal buffer requirements is an interactive process, where the show buffer output should show the total buffers used in a pool at a given time. Permanent buffers should be tuned with regard to the consistent "total" buffers required. When you tune permanent buffers, you should focus on the reduction of creates and the elimination of misses and failures. Check out the following link for more information on tuning buffers for cisco routers :

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00800a7b80.shtml