Documentation/scheduler/sched-bwc.rst

32   (U = \Sum u_i) <= 1
35 stable. After all, if U were > 1, then for every second of walltime,
84 	cpu.cfs_period_us=100ms
85 	cpu.cfs_quota_us=-1
88 A value of -1 for cpu.cfs_quota_us indicates that the group does not have any
95 period is 1ms. There is also an upper bound on the period length of 1s.
120 	/proc/sys/kernel/sched_cfs_bandwidth_slice_us (default=5ms)
163 Once a slice is assigned to a cpu it does not expire.  However all but 1ms of
181 1ms per cpu or as defined by min_cfs_rq_runtime).  This slight burst only
186 also limits the burst ability to no more than 1ms per cpu.  This provides
199 will use up to 1ms additional quota in some periods, thereby preventing the
208 1. Limit a group to 1 CPU worth of runtime::
210 	If period is 250ms and quota is also 250ms, the group will get
211 	1 CPU worth of runtime every 250ms.
213 	# echo 250000 > cpu.cfs_quota_us /* quota = 250ms */
214 	# echo 250000 > cpu.cfs_period_us /* period = 250ms */
218    With 500ms period and 1000ms quota, the group can get 2 CPUs worth of
219    runtime every 500ms::
221 	# echo 1000000 > cpu.cfs_quota_us /* quota = 1000ms */
222 	# echo 500000 > cpu.cfs_period_us /* period = 500ms */
226 3. Limit a group to 20% of 1 CPU.
228    With 50ms period, 10ms quota will be equivalent to 20% of 1 CPU::
230 	# echo 10000 > cpu.cfs_quota_us /* quota = 10ms */
231 	# echo 50000 > cpu.cfs_period_us /* period = 50ms */
236 4. Limit a group to 40% of 1 CPU, and allow accumulate up to 20% of 1 CPU
239    With 50ms period, 20ms quota will be equivalent to 40% of 1 CPU.
240    And 10ms burst will be equivalent to 20% of 1 CPU::
242 	# echo 20000 > cpu.cfs_quota_us /* quota = 20ms */
243 	# echo 50000 > cpu.cfs_period_us /* period = 50ms */
244 	# echo 10000 > cpu.cfs_burst_us /* burst = 10ms */