| What: /sys/module/xen_blkback/parameters/max_buffer_pages | |
| Date: March 2013 | |
| KernelVersion: 3.11 | |
| Contact: Roger Pau Monné <roger.pau@citrix.com> | |
| 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 <roger.pau@citrix.com> | |
| 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 <roger.pau@citrix.com> | |
| 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 <mheyne@amazon.de> | |
| 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 <mheyne@amazon.de> | |
| 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). |