FIFO Optimization - final summary

[Zhao Shuai]

2009/8/22 Ed Schouten <ed at 80386.nl>

> Hi,
>
> * Zhao Shuai <zhaoshuai at freebsd.org> wrote:
> > Hi All,
> >
> > This summer I worked on rewriting the FIFO(named pipe) subsystem.
> > The new FIFO system uses pipe implementation while previously
> > it is implemented as socket.
> >
> > The new FIFO code passes the official regression test and the following
> > bugs has been eliminated: PR 76525,PR 94772,PR 76144,PR 116770.
> > According to my performance test, the new FIFO system increases the
> > throughput by 30% comparing with the old one.
> >
> > I will continue to improve my code after GSoC and hope it can be merged
> > with the main tree.
>
> I'm too lazy to read the source, check out sources, etc. but the pipe
> and fifo code has now been merged, right? Just out of curiosity, how do

these changes affect the kernel binary size? How many lines of code have

been added/removed?


The original pipe code is moved into sys/kern/subr_pipe.c where we deal
with pipe internals. Most of the pipe code is kept untouched except some
changes to several function prototype. /sys/kern/sys_pipe.c is now just a
wrapper of pipe routines.

The affect on the kernel binary size is negligible.

-- 
Regards,
Zhao