Brendan Gregg

MAY 8, 2021

An average of 434 ms is awful, and a small queue size (aqu-sz) indicates it's a problem with the disk and not the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70

Performance 133

Performance Latency Speed Systems 133

Brendan Gregg

MAY 8, 2021

An average of 434 ms is awful, and a small queue size (aqu-sz) indicates it's a problem with the disk and not the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70

Performance 40

Performance Latency Speed Systems 40

Brendan Gregg

MAY 8, 2021

An average of 434 ms is awful, and a small queue size (aqu-sz) indicates it's a problem with the disk and not the workload applied. It may be due to queueing, especially from file systems that send a batch of writes. 66-generic (lgud-bgregg) 12/16/2020 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.70

Performance 40

Performance Latency Speed Systems 40