11d199650SKonrad Rzeszutek WilkWhat: /sys/module/xen_blkback/parameters/max_buffer_pages 21d199650SKonrad Rzeszutek WilkDate: March 2013 31d199650SKonrad Rzeszutek WilkKernelVersion: 3.11 41d199650SKonrad Rzeszutek WilkContact: Roger Pau Monné <roger.pau@citrix.com> 51d199650SKonrad Rzeszutek WilkDescription: 61d199650SKonrad Rzeszutek Wilk Maximum number of free pages to keep in each block 71d199650SKonrad Rzeszutek Wilk backend buffer. 81d199650SKonrad Rzeszutek Wilk 91d199650SKonrad Rzeszutek WilkWhat: /sys/module/xen_blkback/parameters/max_persistent_grants 101d199650SKonrad Rzeszutek WilkDate: March 2013 111d199650SKonrad Rzeszutek WilkKernelVersion: 3.11 121d199650SKonrad Rzeszutek WilkContact: Roger Pau Monné <roger.pau@citrix.com> 131d199650SKonrad Rzeszutek WilkDescription: 141d199650SKonrad Rzeszutek Wilk Maximum number of grants to map persistently in 151d199650SKonrad Rzeszutek Wilk blkback. If the frontend tries to use more than 161d199650SKonrad Rzeszutek Wilk max_persistent_grants, the LRU kicks in and starts 171d199650SKonrad Rzeszutek Wilk removing 5% of max_persistent_grants every 100ms. 18*973e5405SJuergen Gross 19*973e5405SJuergen GrossWhat: /sys/module/xen_blkback/parameters/persistent_grant_unused_seconds 20*973e5405SJuergen GrossDate: August 2018 21*973e5405SJuergen GrossKernelVersion: 4.19 22*973e5405SJuergen GrossContact: Roger Pau Monné <roger.pau@citrix.com> 23*973e5405SJuergen GrossDescription: 24*973e5405SJuergen Gross How long a persistent grant is allowed to remain 25*973e5405SJuergen Gross allocated without being in use. The time is in 26*973e5405SJuergen Gross seconds, 0 means indefinitely long. 27*973e5405SJuergen Gross The default is 60 seconds. 28