hacking - aio_sendfile()

[Adrian Chadd]

On 11 July 2013 02:36, Konstantin Belousov <kostikbel at gmail.com> wrote:

> No, it is not disk I/O which is problematic there. It is socket I/O
> e.g. wait for the socket buffers lomark in the kern_sendfile() which
> causes unbounded sleep. Look for the sbwait() call, both in the
> kern_sendfile() itself, and in the pru_send methods of the protocols,
> e.g. in sosend_generic(). The wait scope controlled by the other side of
> connection and allow it to completely block the aio subsystem.
>
> Disk I/O is supposed to finish in the finite time.

Even if the destination socket is marked as NONBLOCK?


-adrian