Messages in this thread | | | Date | Tue, 8 May 2001 18:20:55 +0200 | From | Jamie Lokier <> | Subject | Re: [Question] Explanation of zero-copy networking |
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Alan Cox wrote: > > so there's still single copy for write() of a mmap()ed page? > > An mmap page will go direct to disk.
Looking at the 2.4.4 code, mmap() of file followed by write() to socket will copy the data once.
I could be mistaken (only glanced at the code quickly) but I base that on the only call to ->sendpage being through sendfile.
So yes, there's a single copy overhead for mmap()+write().
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