Messages in this thread |  | | Date | Sun, 3 Sep 2000 19:34:18 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: zero-copy TCP |
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On 3 Sep 2000, Jes Sorensen wrote:
> At CERN we had a bunch of applications where this would be a win, data > aquisition servers taking data in from on some custom hardware and > sending out data over the wire on another card. You never really want > to touch data in memory with the CPU but because of the lack of > write() zero copy you end up having to do so.
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.
Ingo
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