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Invisible Yet Dominant: Big Stalls of Kernel I/O Mechanisms in Cloud OLTP Databases
Most databases, including PostgreSQL, RocksDB, and recent AI KV-cache middleware, rely on buffered I/O, delegating write-back to the Linux kernel. On the distributed block storage standard in the cloud, this delegation inherits a hidden bottleneck: each device is drained by a single kernel flusher t
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