The FUSE feature enhancements were submitted today for the [1]Linux 6.13 kernel as part of improving the file-system in user-space capabilities.

One of the notable FUSE changes for Linux 6.13 is allowing the maximize size of FUSE requests to be configurable via a new sysctl setting. The "FUSE_MAX_MAX_PAGES" value now can be configured via the "fs.fuse.max_pages_limit" sysctl tunable or as /proc/sys/fs/fuse/fuse_max_max_pages . Up to now FUSE defaulted to 256 as the maximum number of pages which for a 4K page-size kernel meant just a maximum write size of 1MB.

In turn increasing this max_pages_limit for FUSE can allow for better performance by taking advantage of a larger maximum write size. Quadrupling the fuse_max_max_pages value to 1024 has yielded a nice performance improvement in some situations.

The FUSE code in Linux 6.13 also completes more page to folio conversions and brings several fixes. More details on the FUSE changes via [2]this pull request .



[1] https://www.phoronix.com/search/Linux+6.13

[2] https://lore.kernel.org/lkml/CAJfpegvCr7hBSqU8iqKUCZ3i5wUyiiyfbCtP_NO37OGMA2RVPw@mail.gmail.com/