Subj : [$] Measuring and improving buffered I/O
To   : All
From : LWN.net
Date : Wed Jun 05 2024 21:30:05

[$] Measuring and improving buffered I/O

Date:
Wed, 05 Jun 2024 20:22:41 +0000

Description:
There are two types of file I/O on Linux, buffered I/O, which goes through
the page cache, and direct I/O, which goes directly to the storage device.
The performance of buffered I/O was reported to be a lot worse than direct
I/O, especially for one specific test, in Luis Chamberlain's topic
proposal for a session at the 2024 Linux Storage,
Filesystem, Memory Management, and BPF Summit .
The proposal resulted in a lengthy mailing-list discussion, 
which also came up in Paul McKenney's RCU session the next
day; Chamberlain led a 
combined storage and filesystem session to discuss those results with an
eye toward improving buffered I/O performance.

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Link to news story:
https://lwn.net/Articles/976856/


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