Kacheong Poon wrote:
James Carlson wrote:
I recall seeing questions from customers and/or ISVs who wanted to
have this in Solaris, but I don't see that any RFEs were ever filed.
Actually, Jerry Chu tried to do this project long long time
ago. He even filed a 1-pager (dated 7/22/97) with some technical
explanations. I forgot the reason why this project did not work
out. In case people are interested, I include the technical part
of the 1-pager below.
---
2.1. Project Description
Provide an efficient, copyless, in-kernel shortcut for moving
data between different I/O objects. The premise is that no
user inspection and/or manipulation of the data is needed.
This project provides a new system call, splice() that
moves data all in the kernel address space between two I/O
objects identified by file descriptors. The motivation
is to improve I/O performance and reduce CPU utilization.
The description of splice() sounds a lot like sendfile() and sendfilev()
that we have in Solaris.
TransmitFile() man page from Winsock2, WIN32 SDK for Windows NT
That reference adds weight to the similarity.
I don't think sendfile is what was being proposed here though.
--
Darren J Moffat
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