ceph/doc/dev/osd_internals/osd_throttles.txt

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Messenger throttle (number and size)
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
FileStore op_queue throttle (number and size)
|--------------------------------------------------------|
WBThrottle
|---------------------------------------------------------------------------------------------------------|
Journal (size)
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
|----------------------------------------------------------------------------------------------------> flushed ----------------> synced
|
Op: Read Header --DispatchQ--> OSD::_dispatch --OpWQ--> PG::do_request --journalq--> Journal --FileStore::OpWQ--> Apply Thread --Finisher--> op_applied -------------------------------------------------------------> Complete
| |
SubOp: --Messenger--> ReadHeader --DispatchQ--> OSD::_dispatch --OpWQ--> PG::do_request --journalq--> Journal --FileStore::OpWQ--> Apply Thread --Finisher--> sub_op_applied -
|
|-----------------------------> flushed ----------------> synced
|------------------------------------------------------------------------------------------|
Journal (size)
|---------------------------------|
WBThrottle
|-----------------------------------------------------|
FileStore op_queue throttle (number and size)