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The constants MAX_COMPLETIONS and MSG_QUEUE_SIZE control the number of messages that can be outstanding to each client before the system as a whole stalls. If the numbers are too small then unnecessary thread switching will occur while waiting for a (potentially low priority) client thread to consume some data; badly written clients can even lead to deadlock. For services that carry many short messages, 16 messages can represent a very small amount of data. Since the resources are small - 16 bytes for a completion, 4 bytes for a message pointer - increase the limits so they are unlikely to be hit except in exceptional circumstances. Signed-off-by: Phil Elwell <phil@raspberrypi.org> Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.