On Wed, 2007-03-21 at 22:37 -0400, Douglas Gilbert wrote:
>
>
> In my experience mmap-ed IO using sg's reserve buffer mapped
> into the user space is faster than direct IO schemes. However
> one shortcoming is that if you try to copy between two devices
> using this technique then you end up with
I mentioned this idea a few weeks ago on this list: namely
to allow a sg pass-through request to use the mmap-ed
reserve buffer associated with another sg file descriptor.
In my experience mmap-ed IO using sg's reserve buffer mapped
into the user space is faster than direct IO schemes. However
one
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