Anyone have good a good refrence on cisco routers and their use of buffers,
including discussions on optimizing their size?
The IOS internals book (sorry, I'm blanking on the exact title) has a
detailed discussion of buffering.
As far as optimizing them, however, my best advice is:
1. Leave them alone unless there appears to be a problem. Precise
details of buffer handling are release- and platform-dependent.
In any case, a great deal of effort is expended in ANY modern
operating system to have buffer management be self-tuning.
2. If there does appear to be a problem, involve the TAC. Figuring
out what's needed may very well need to involve someone with
code access.
I've rarely needed to tune buffers, certainly in recent IOS releases.
About the only general rule I could suggest is when forcing a WAN
interface into process switching to get more buffers or per-packet
load balancing, be sure the buffer pool can hold a full window (of
whatever windowing protocols you are using).
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