Linux Device Drivers Development

Write caching strategies

Depending on the cache strategy, several benefits may be enumerated:

• Reduced latency on data accessing, thus increasing application performance
• Improved storage lifetime
• Reduced system workload
• Reduced risk of data loss

Caching algorithms usually fall into one of the following three different strategies:

1. The write-through cache is where any write operation will automatically update both the memory cache and the permanent storage. This strategy is preferred for applications where data loss cannot be tolerated, and applications that write and then frequently re-read data (since data is stored in the cache and results in low read latency).
2. The write-around cache is similar to write-through, with the difference that ...