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manual abstract
GENERAL NETWORKING
• Hardware Potential Performance Changes
– Routers –
• Since routers have intelligence inside of them, data is stored in
buffers
• Common performance problems related to buffer al ocation
Middle buffers, 600 bytes (total 150, permanent 25): 147 in free list (10 min, 150 max
al owed) 61351931 hits, 137912 misses, 51605 trims, 51730 created 91652 failures (0 no
memory)
– permanent: take the number of total buffers in a pool and add about 20%.
– min-free: set min-free to about 20-30% of the permanent number of al ocated buffers in the pool.
– max-free: set max-free to something greater than the sum of permanents and minimums
buffer middle permanent
180
buffer middle min-free
50
buffer middle max-free
235
• Adjust for traffic burst
• Slow traffic – Min free goes up
• Fast traffic – Permanent goes up
11/13/2008
HP presentation template user tutorial
page 12
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