Re: zero-copy TCP

From: Dan Kegel (
Date: Sun Sep 03 2000 - 14:13:57 EST

Ingo Molnar ( wrote:
> yep i agree - in this case a receivefile() implementation would be handy
> (we are 100% ready in 2.4 to introduce it - from the pagecache and VFS
> point of view, it's just not there yet), thus you could receivefile() your
> data into a temporary file, and sendfile() it to the other card, without
> ever touching data. This is faster than any zero-copy read()/write(),
> because it can do things straight in the pagecache, without having to deal
> with user-space page mappings.

Interface-wise, what would be the difference between receivefile() and sendfile()?
Don't both just transfer data between two arbitrary file descriptors?
- Dan
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