Chapter 9. Disk I/O
Disk I/O is a common source of performance issues because I/O latency to a heavily loaded disk can reach tens of milliseconds or more—orders of magnitude slower than the nanosecond or microsecond speed of CPU and memory operations. Analysis with BPF tools can help find ways to tune or eliminate this disk I/O, leading to some of the largest application performance wins.
The term disk I/O refers to any storage I/O type: rotational magnetic media, flash-based storage, and network storage. These can all be exposed in Linux in the same way, as storage devices, and analyzed using the same tools.
Between an application and a storage device is usually a file system. File systems employ caching, read ahead, buffering, and asynchronous ...
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