Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1

[Christoph Hellwig]

On Tue, Jan 09, 2001 at 12:55:51PM -0800, Linus Torvalds wrote:
> 
> 
> On Tue, 9 Jan 2001, Christoph Hellwig wrote:
> > 
> > Also the tuple argument you gave earlier isn't right in this specific case:
> > 
> > when doing sendfile from pagecache to an fs, you have a bunch of pages,
> > an offset in the first and a length that makes the data end before last
> > page's end.
> 
> No.
> 
> Look at sendfile(). You do NOT have a "bunch" of pages.
> 
> Sendfile() is very much a page-at-a-time thing, and expects the actual IO
> layers to do it's own scatter-gather. 
> 
> So sendfile() doesn't want any array at all: it only wants a single
> page-offset-length tuple interface.

The current implementations does.
But others are possible.  I could post one in a few days to show that it is
possible.

	Christoph

-- 
Whip me.  Beat me.  Make me maintain AIX.