EXT4 Gets More Direct I/O Optimizations - Can Help Some Database Workloads Around ~140%+
A few days ago I wrote about a big improvement to write performance for EXT4's Direct I/O code path but that is not the only DIO optimization coming for Linux 5.6. Thanks to IBM, another big EXT4 DIO boost can be found for database workloads.
Other EXT4 development work currently in its queue ahead of the Linux 5.6 cycle is helping the inode lock scalability for Direct I/O mixed read/write workloads. The issue was pointed out by an Alibaba engineer last summer in a significant performance regression with EXT4's DIO performance under mixed read/write scenarios. The Alibaba engineer bisected the issue to a mainline kernel commit from 2016 when the performance became worse. The problem was quite noticeable with an Intel P3600 NVMe solid-state drive.
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