My guesstimate would be: Yes, you should see a slight performance
increase if you use pbufs equal to the maximum size of ethernet frames.
Compared to smaller pbufs of size 300Bytes or so.
But it will waste alot of RAM.
It will also depend alot on your application. If 90% of all packets are
less than 300Bytes, then there is little reason to use pbufs larger than
300bytes.
However, if your application use alot of maximum sized packets, then
large pbufs would make sense.
I see the capability to chain smaller pbufs to conserve wast amounts of
RAM as one of the major advantages of lwip compared to most other TCP/IP
stacks. One of the more popular (and extremely expensive) commercial
TCP/IP stack for embedded systems can not do this.
Timmy Brolin
Amir Bukhari wrote:
Is the performance increase when I use big pbuf size? In my system I have
enough memory for pools. I can alocate for TCP 1~5 MB.
-Amir
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