In the InnoDB plugin, a new variable was added named innodb_io_capacity, which controls the maximum
number of I/O operations per second that InnoDB will perform
(which includes the flushing rate of dirty pages as well as the
insert buffer (ibuf) batch size).
First off, let me just say this is a welcome addition (an addition provided by the Google Team, fwiw).
However, before this was configurable, the internal …