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The content of this article mainly focuses on how Linux's exFAT file system deletes large files more quickly. The content of the article is clear and clear. It is very suitable for beginners to learn and is worth reading. Interested friends can follow the editor to read together. I hope you can get something through this article!

Linux kernel developers have submitted a patch on exFAT optimization: when using the "dirsync" installation option, the cluster allocation bitmap will not synchronize the buffer buffer when each cluster bit is cleared, but will only be updated when the bitmap buffer index changes. This improvement greatly optimizes performance when deleting large files.

In version 5.12 of the Linux kernel, users of the exFAT file system will be much faster when deleting large files with the "dirsync" installation option set.

What is exFAT?

ExFAT (Extended File Allocation Table) is a file system developed by Microsoft that is more suitable for flash memory. The file system was first introduced from the company's Windows Embedded CE 6.0operating system, and then extended to the Windows Vista Service Pack 1 operating system. In 2019, Microsoft released the exFAT technical documentation and said it wanted to integrate exFAT functionality into the Linux kernel. In the same year, the exFAT file system was initially supported in version 5.4 of the Linux kernel.

The exFAT file system deletes large files faster

Recently, Linux kernel developers submitted a patch on exFAT optimization: when using the "dirsync" installation option, the cluster allocation bitmap will not synchronize the buffer buffer when each cluster bit is cleared, but will only be updated when the bitmap buffer index changes. This improvement greatly optimizes performance when deleting large files.

There are stressful update of cluster allocation bitmap when using

Dirsync mount option which is doing sync buffer on every cluster bit

Clearing. This could result in performance degradation when deleting

Big size file.

Fix to update only when the bitmap buffer index is changed would make

Less disk access, improving performance especially for truncate operation

When testing using the Samsung 256GB SD card, dirsync installation option, the time to delete 4GB files was reduced from 39 seconds to 1 second.

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