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http://www.360doc.com/content/09/0212/23/98883_2529182.shtml
Kernel Asynchronous I/O (AIO) Support for Linux Overview AIO enables even a single application thread to overlap I/O operations with other processing, by providing an interface for submitting one or more I/O requests in one system call ( io_submit() ) without waiting for completion, and a separate interface (io_getevents() ) to reap completed I/O operations associated with a given completion group.
https://www.ibm.com/support/knowledgecenter/en/SSGU8G_12.1.0/com.ibm.admin.doc/ids_admin_0301.htm
Linux only: Kernel asynchronous I/O (KAIO) is enabled by default. You can disable this by specifying that KAIOOFF=1 in the environment of the process that starts the server. On Linux, there is a system-wide limit of the maximum number of parallel KAIO requests.
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/kernelextension/async_io_subsys.html
A kernel process (kproc), called an AIO server (AIOS), is in charge of each request from the time it is taken off the queue until it completes. The number of servers limits the number of disk I/O operations that can be in progress in the system simultaneously.
https://www.ibm.com/support/pages/tuning-kernel-asynchronous-io-kaio-ibm-informix-hp-ux
This article goes over the environment variable that can be used to change the default resources used by the engine for Kernel Asynchronous I/O (KAIO) on the HP-UX platform. Tuning Kernel Asynchronous I/O (KAIO) for IBM Informix on HP-UX
https://www.ibm.com/support/pages/tuning-asynchronous-io-kernel-parameters-avoid-error-kaio-out-resource-hp-ux
All configurable kernel parameters must be specified using an integer value or a formula consisting of a valid integer expression. The maximum and/or default values of certain parameters may change between releases or to vary between 32-bit and 64-bit processors.
https://www.kernel.org/doc/ols/2003/ols2003-pages-351-366.pdf
This paper describes the Asynchronous I/O (AIO) support in the Linux® 2.5 kernel, addi-tional functionality available as patchsets, and plans for further improvements. More specifi-cally, the following topics are treated in some depth: • Asynchronous filesystem I/O • Asynchronous direct I/O • Asynchronous vector I/OCited by: 19
https://www.ibm.com/support/pages/tuning-kernel-asynchronous-io-kaio-ibm-informix-aix
Then the Kernel Asynchronous I/O (KAIO) subsystem may need to be tuned. The IBM Informix engines do this thru an Operating System (OS) structure called an Asynchronous IO Control Block (AIOCB). A certain number of AIOCB's are allocated at initialization time and reused as …
https://github.com/unigent/openwrt-3.10.14/blob/master/config/Config-kernel.in
Compile the kernel with early printk support. This is only useful for debugging purposes to send messages: over the serial console in early boot. Enable this to debug early boot problems. config KERNEL_AIO: bool "Compile the kernel with asynchronous IO support" default n: config KERNEL_DIRECT_IO: bool "Compile the kernel with direct IO support ...
https://stackoverflow.com/questions/28999765/how-does-the-linux-kernel-handle-asynchronous-i-o-aio-requests
Multiple sync I/O requests results in the same benefits as multiple async I/O requests. The main differences between asynchronous and synchronous I/O come down to how I/O & processes scheduling and to the programming model. Both async & sync I/O can squeeze the same IOPS/throughput from a storage device if done right.
https://github.com/coolsnowwolf/lede/blob/master/config/Config-kernel.in
This will give you more information in stack traces from kernel oopses. This will compile your kernel and modules with debug information. ARM low level debugging. Compile the kernel with early printk support. Enable this to debug early boot problems.
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