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1What: /sys/module/xen_blkback/parameters/max_buffer_pages2Date: March 20133KernelVersion: 3.114Contact: Roger Pau Monné <roger.pau@citrix.com>5Description:6 Maximum number of free pages to keep in each block7 backend buffer.8 9What: /sys/module/xen_blkback/parameters/max_persistent_grants10Date: March 201311KernelVersion: 3.1112Contact: Roger Pau Monné <roger.pau@citrix.com>13Description:14 Maximum number of grants to map persistently in15 blkback. If the frontend tries to use more than16 max_persistent_grants, the LRU kicks in and starts17 removing 5% of max_persistent_grants every 100ms.18 19What: /sys/module/xen_blkback/parameters/persistent_grant_unused_seconds20Date: August 201821KernelVersion: 4.1922Contact: Roger Pau Monné <roger.pau@citrix.com>23Description:24 How long a persistent grant is allowed to remain25 allocated without being in use. The time is in26 seconds, 0 means indefinitely long.27 The default is 60 seconds.28 29What: /sys/module/xen_blkback/parameters/buffer_squeeze_duration_ms30Date: December 201931KernelVersion: 5.632Contact: Maximilian Heyne <mheyne@amazon.de>33Description:34 When memory pressure is reported to blkback this option35 controls the duration in milliseconds that blkback will not36 cache any page not backed by a grant mapping.37 The default is 10ms.38 39What: /sys/module/xen_blkback/parameters/feature_persistent40Date: September 202041KernelVersion: 5.1042Contact: Maximilian Heyne <mheyne@amazon.de>43Description:44 Whether to enable the persistent grants feature or not. Note45 that this option only takes effect on newly connected backends.46 The default is Y (enable).47