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doc/user.rst: document io_uring

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Max Kellermann 2020-10-06 18:57:43 +02:00
parent 6e893f40e3
commit bf270a5663
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@ -1108,6 +1108,19 @@ See :ref:`realtime`. You can safely ignore this, but you won't
benefit from real-time scheduling. This only makes a difference if
your computer runs programs other than MPD.
Error "Failed to initialize io_uring"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Linux specific: the io_uring subsystem could not be initialized. This
is not a critical error - MPD will fall back to "classic" blocking
disk I/O. You can safely ignore this error, but you won't benefit
from io_uring's advantages.
* "Cannot allocate memory" usually means that your memlock limit
(``ulimit -l`` in bash or ``LimitMEMLOCK`` in systemd) is too low.
64 MB is a reasonable value for this limit.
* Your Linux kernel might be too old and does not support io_uring.
Error "bind to '0.0.0.0:6600' failed (continuing anyway, because binding to '[::]:6600' succeeded)"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~