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buffer tuning 6509 [7:56891] posted 11/05/2002
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Does anybody know of a good white paper on buffer tuning?  I have read a
couple of generic ones on Cisco's website, yet they are not
good enough to satisfy what I need to know.  Called TAC - not a whole
lot of help this time!  As you can see, there are a lot of misses on 
medium and middle buffers.  I also see that total and permanent are
not allocated.  I know the general CCNP level of what those mean and
commands to adjust them, but does anybody know this - the second line
of output says that there are 500 max allowed.  Does that mean that
I need to break this number down into public buffer pool?  Does that mean
that the cumulative sum of all public pools can't be more than 500?  (as you
can see, the big buffers are 500).  Does anybody know of a GOOD paper that
gives examples of buffer tuning? Sorry if those are  stupid questions.

here is the output:

Buffer elements:
     499 in free list (500 max allowed)
     898918875 hits, 0 misses, 0 created

Public buffer pools:
Small buffers, 104 bytes (total 73, permanent 50, peak 1501 @ 7w0d):
     72 in free list (20 min, 150 max allowed)
     609248534 hits, 201320 misses, 121659 trims, 121682 created
     86630 failures (0 no memory)
Medium buffers, 256 bytes (total 0, permanent 0, peak 123 @ 4d08h):
     0 in free list (0 min, 0 max allowed)
     705511 hits, 140644897 misses, 1414484 trims, 1414484 created
     139937655 failures (0 no memory)
Middle buffers, 600 bytes (total 150, permanent 25, peak 555 @ 7w0d):
     149 in free list (10 min, 150 max allowed)
     185320811 hits, 4615702 misses, 167032 trims, 167157 created
     4439672 failures (0 no memory)
Big buffers, 1524 bytes (total 500, permanent 500, peak 595 @ 7w0d):
     500 in free list (5 min, 500 max allowed)
     41418467 hits, 3577401 misses, 39229 trims, 39229 created
     3540388 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10, peak 20 @ 7w0d):
     10 in free list (0 min, 100 max allowed)
     1006090 hits, 3524469 misses, 22 trims, 22 created
     3524458 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 10 max allowed)
     0 hits, 3524458 misses, 0 trims, 0 created
     3524458 failures (0 no memory)
Huge buffers, 18024 bytes (total 2, permanent 0, peak 2 @ 7w0d):
     2 in free list (0 min, 4 max allowed)
     4580 hits, 3522061 misses, 120 trims, 122 created
     3522000 failures (0 no memory)


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