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    SubjectRe: zero-copy read() interface
    On Thu, 18 August 2005 16:34:18 -0700, dean gaudet wrote:
    > On Thu, 18 Aug 2005, Folkert van Heusden wrote:
    > > Doesn't that one also use copying? I've also heard that using mmap is
    > > expensive due to pagefaulting. I've found, for example, that copying a
    > > 1.3GB file using read/write instead of mmap & memcpy is seconds faster.
    > why would you memcpy if you're using mmap()? just write() the mmap()d
    > region.

    Still unnecessary. Userspace doesn't want to see the data at all, so
    it shouldn't. The solution should either be sendfile(2), which Linus
    doesn't like much, or the upcoming pipe stuff.


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      Last update: 2005-08-19 10:37    [W:0.021 / U:73.876 seconds]
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