Re: dd PATCH: add conv=direct

[Jim Meyering]

Paul Eggert <address@hidden> wrote:
> Assuming Jim Meyering like the idea of adding O_DIRECT support to
> cp/mv, the next thing is to see how that might be done.

I'm inclined to support it, based on Philip's anecdote about
`cp' being much more efficient when using O_DIRECT.

Philip, before we go too much further, can you describe the
circumstances (hardware, OS, file system type, file sizes) under
which O_DIRECT helps, and how much of a performance improvement
to expect?  It would probably be enough just to describe your graph
  http://oss.oracle.com/~bryce/cp.gif
and the test conditions.