user level TCP implementation

Does anyone know of a user level implementation of the TCP stack for
Linux?

Thanks!

On May 13, 2:39 pm, sumati <sumat...@yahoo.com> wrote:
> Does anyone know of a user level implementation of the TCP stack for
> Linux?
>
> Thanks!

Why do you need an user level TCP stack in a production system. With
gigabit speeds available, there will be large number of context
switches and hence TLB flushes which will degrade the performance of
the system. The only reason I can think of for having user level TCP
stack is for stack to be available all the time (if it crashes, "init"
will start it again) and upgrading stack without kernel reboot.Though
I still strongly feel all the I/O (whether network, file etc) should
be done in kernel.

Here is one project that has implemented user level TCP/IP stack for
Linux

http://www.cs.northwestern.edu/~pdinda/minet/

Thanks,
Tejas Kokje