Redfs ubuntu noble 6.8.0 58.60 updates reduce queues #6
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This is another preparation and will be used for decision which queue to add a request to.
This is preparation for follow up commits that allow to run with a reduced number of queues. Signed-off-by: Bernd Schubert <[email protected]>
jianhuangli
reviewed
Jun 26, 2025
So far queue selection was statically - the a request on core X was always handled by the queue corresponding to core X. A previous commit introduced bitmaps that track which queues are available - queue selection can make use of these bitmaps and try to use the ideal queue. Rules are - Tries the queue of the current core first, if available and if that queue does not have too many entries queued - Then tries the first available queue on the current numa node. It does not use random distribution here, because light queue usage is probably ok, so that kernel/userspace switches can be avoided - Then tries the first available global queue ignoring numa nodes. If no queue is free, it tries again the queue of the current core, but if that queue does not exist it falls back to a random queue on the current numa node - that also might not exist - it then uses a random available queue.
Now that queue selection for fuse requests supports missing queues we don't need to wait for full queue initialization. In fact, fuse-server (daemon) might want to run with a reduced number of queues, for example to reduce memory usage. This also simplifies startup - after first queue entry registration fuse-io-uring is ready to be used. Signed-off-by: Bernd Schubert <[email protected]>
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@jianhuangli thank you, updated the commit message. |
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