App : IO Scheduler *advanced*

[shantanu]

Hey guys, here is a simple MGX to change E8 kernel's IO scheduler (AKA request elevator). This is only intended for advanced users. Dont worry, this app is not dangerous at all, its just that casual users will never need to change their schedulers, but pros will

WHAT IS AN IO SCHEDULER

IO scheduler is a daemon thread deep down in Linux Kernel which always runs in background, reads files from disk and hands them over to various programs. Whenever ANY program reads file from disk, that request is processed by IO scheduler.

Normally a IO scheduler tries to balance between these goals:
- fairness (let every process have its share of the access to disk, but decides which ones need data on priority)
- performance (try to serve requests fastest)

There are various IO scheduler available in Linux Kernel which perform different.

WHAT SCHEDULERS ARE AVAILABLE?

* noop = It holds all the requests in a queue does and not perform any scheduling on them. Should be the fastest for low IO systems
* anticipatory (default) = It 'guesses' for the data that user might ask for in future and loads it in advance. This is the default scheduler on E8. IMHO, while anticipatory can be very good for desktop systems and moving head disks, it might slow things on SSD based systems with low RAM, like E8. Hence i felt a need for an app to change it.
* deadline = sets an internal deadline (priorities) for every request. Read request have smaller deadline (hence higher priority) than write requests. Should perform best on medium IO systems.
* cfq = Completely Fair Queuing, best suited for multiuser systems.




credits to the CORESOLO

[alxbrt]

Tks! Very interesting!

[l0veysingh]

thanks for sharing SANTY,,...