Effect of timer interrupt interval on file system synchronization overhead

Hankeun Son, Seongjin Lee, Youjip Won

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

File system metadata is indispensable in both describing the data and maintaining the file system. Despite the importance of metadata in the file system, the overhead of maintaining the metadata cannot be taken lightly. It is because the metadata also have to be persisted on the storage device and it consumes IO bandwidth as well as creates journaling overhead. In this paper, we find that the random write with synchronous performance of a storage is significantly affected by not only the hardware performance but also timer interrupt interval of the kernel. Extending the timer interrupt interval allows reducing the write volume and increasing the random write followed by fsync() performance of EXT4 file system. We propose intermittent mtime timestamp update on Coarse grain mtime interval instead of Fine grain mtime interval. The experiment results with mtime update interval of 1 second show that the total write volume is decreased by 75% and 28%, respectively compared to total write volume of 1 ms and 10 ms mtime interval, and the throughput increased 3.1× and 1.2× compared to 1 ms and 10 ms mtime interval. Coarse grain mtime update is resolve to the journaling overhead issues while still logging mtime timestamp.

Original languageEnglish
Title of host publicationProceedings of 2016 5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages99-102
Number of pages4
ISBN (Electronic)9781509012459
DOIs
StatePublished - 2017 Jul 10
Event5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016 - Beijing, China
Duration: 2016 Sep 232016 Sep 25

Publication series

NameProceedings of 2016 5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016

Other

Other5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016
CountryChina
CityBeijing
Period16/09/2316/09/25

Keywords

  • EXT4 file system
  • Journaling overhead
  • Kernel timer interrupt
  • Random write
  • mtime

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    Son, H., Lee, S., & Won, Y. (2017). Effect of timer interrupt interval on file system synchronization overhead. In Proceedings of 2016 5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016 (pp. 99-102). [7974543] (Proceedings of 2016 5th International Conference on Network Infrastructure and Digital Content, IEEE IC-NIDC 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICNIDC.2016.7974543