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- What: /sys/module/xen_blkback/parameters/max_buffer_pages
- Date: March 2013
- KernelVersion: 3.11
- Contact: Roger Pau Monné <[email protected]>
- Description:
- Maximum number of free pages to keep in each block
- backend buffer.
- What: /sys/module/xen_blkback/parameters/max_persistent_grants
- Date: March 2013
- KernelVersion: 3.11
- Contact: Roger Pau Monné <[email protected]>
- Description:
- Maximum number of grants to map persistently in
- blkback. If the frontend tries to use more than
- max_persistent_grants, the LRU kicks in and starts
- removing 5% of max_persistent_grants every 100ms.
- What: /sys/module/xen_blkback/parameters/persistent_grant_unused_seconds
- Date: August 2018
- KernelVersion: 4.19
- Contact: Roger Pau Monné <[email protected]>
- Description:
- How long a persistent grant is allowed to remain
- allocated without being in use. The time is in
- seconds, 0 means indefinitely long.
- The default is 60 seconds.
- What: /sys/module/xen_blkback/parameters/buffer_squeeze_duration_ms
- Date: December 2019
- KernelVersion: 5.6
- Contact: Maximilian Heyne <[email protected]>
- Description:
- When memory pressure is reported to blkback this option
- controls the duration in milliseconds that blkback will not
- cache any page not backed by a grant mapping.
- The default is 10ms.
- What: /sys/module/xen_blkback/parameters/feature_persistent
- Date: September 2020
- KernelVersion: 5.10
- Contact: Maximilian Heyne <[email protected]>
- Description:
- Whether to enable the persistent grants feature or not. Note
- that this option only takes effect on newly connected backends.
- The default is Y (enable).
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