Re: Linux 2.6.17-rc2

[Piet Delaney]

On Fri, 2006-04-21 at 04:05 +0200, Andi Kleen wrote:
> Piet Delaney <piet@xxxxxxxxxxxx> writes:
> > 
> > FreeBSD folks developed a ZERO_COPY_SOCKET facility that uses COW; 
> > code looked great.
> 
> Linux had patches many years ago (in 2.3.x), but it was never merged
> because it is inherently unscalable on MP. Classical BSD sockets really 
> don't work well for zero copy - you need a new interface (like POSIX aio) 
> that allows the kernel/user to tell each other when use of data is
> finished and buffers can be reused.

Right, back when I was working on zero copy for 2.4 I noticed that 
2.6 seemed to support aio in the socket code, passing the kiocb 
pointer as I recall, and support in the socket  code for for sendpage
seemed enhanced. I was also wondering about using 2.6 and aio for zero
copy instead of tokens via sendmsg() and recvmsg() cmsghdr structures.

-piet

> 
> -Andi
> -
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