Help on TCP Output/Input

Koushik Chakraborty (kchak@iitk.ac.in)
Thu, 7 Oct 1999 21:22:36 +0530 (IST)

Hi,
I am developing an application which needs certain support from kernel
(via system call) to speed up data transfer from one socket to one or more
sockets. I don't want to use the system calls like read,write as this
involves too many buffer copies and also context switches (from user to
kernel). Instead, I want the kernel to read the data from sk_buff que of
the source sockets and push directly into those for the destination
sockets.

I have been trying to understand various things on this regard for last
few weeks by going through the Linux kernel source code (version 2.2.9).
Could you please clarify a few doubts in this regards ..

A> At which point in the TCP implementaion, do you have ordered,
non-duplicated data stream (as if ready to be consumed by the
application).

B> Is it possible to retrive this data stream and form into sk_buff and
subsequently call tcp_write for the outgoing sockets ? I mean will it
actually take care of ACK's and sliding-window management ?

C> Can anybody suggest any other or possibly best way to achieve this ?

Thanks,
Koushik

***********************************************************************
Koushik Chakraborty
Senior Undergraduate,
Dept. of Computer Science and Engineering.
Indian Institute of Technology,Kanpur
India.
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Contact Address :- E-mail :

Room no. A111, Hall - 1 kchak@iitk.ac.in.
IIT Kanpur, kchak@mailcity.com
Pin 208016.
India.

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