[$] 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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