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-Queue sysfs files
-This text file will detail the queue files that are located in the sysfs tree
-for each block device. Note that stacked devices typically do not export
-any settings, since their queue merely functions are a remapping target.
-These files are the ones found in the /sys/block/xxx/queue/ directory.
-Files denoted with a RO postfix are readonly and the RW postfix means
-hw_sector_size (RO)
-This is the hardware sector size of the device, in bytes.
-max_hw_sectors_kb (RO)
-This is the maximum number of kilobytes supported in a single data transfer.
-max_sectors_kb (RW)
-This is the maximum number of kilobytes that the block layer will allow
-for a filesystem request. Must be smaller than or equal to the maximum
-size allowed by the hardware.
-nomerges (RW)
-This enables the user to disable the lookup logic involved with IO
-merging requests in the block layer. By default (0) all merges are
-enabled. When set to 1 only simple one-hit merges will be tried. When
-set to 2 no merge algorithms will be tried (including one-hit or more
-complex tree/hash lookups).
-nr_requests (RW)
-This controls how many requests may be allocated in the block layer for
-read or write requests. Note that the total allocated number may be twice
-this amount, since it applies only to reads or writes (not the accumulated
-read_ahead_kb (RW)
-Maximum number of kilobytes to read-ahead for filesystems on this block
-rq_affinity (RW)
-If this option is '1', the block layer will migrate request completions to the
-cpu "group" that originally submitted the request. For some workloads this
-provides a significant reduction in CPU cycles due to caching effects.
-For storage configurations that need to maximize distribution of completion
-processing setting this option to '2' forces the completion to run on the
-requesting cpu (bypassing the "group" aggregation logic).
-scheduler (RW)
-When read, this file will display the current and available IO schedulers
-for this block device. The currently active IO scheduler will be enclosed
-in [] brackets. Writing an IO scheduler name to this file will switch
-control of this block device to that new IO scheduler. Note that writing
-an IO scheduler name to this file will attempt to load that IO scheduler
-module, if it isn't already present in the system.
-Jens Axboe <>, February 2009