Re: [lwip-users] Performance Question about pbuf

[Timmy Brolin]

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
>
>
> _______________________________________________
> lwip-users mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/lwip-users
>
>
>