Messages in this thread | | | Date | Tue, 4 Apr 2006 08:36:14 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] sched: improve smpnice load balancing when load per task imbalanced |
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* Peter Williams <pwil3058@bigpond.net.au> wrote:
> Problem: > > 2 CPU system: if the cpu-0 has two high priority and cpu-1 has one > normal priority task, how can the current code detect this imbalance > because imbalance will be always < busiest_load_per_task and max_load > - this_load will be < 2 * busiest_load_per_task and pwr_move will be > <= pwr_now. > > Solution: > > Modify the assessment of small imbalances to take into account the > relative sizes of busiest_load_per_task and this_load_per_task. This > is exploiting the fact that if the difference between the loads is > greater than busiest_load_per_task and busiest_load_per_task is > greater than this_load_per_task then moving busiest_load_per_task > worth of load from busiest to this will be an improvement in the > distribution of weighted load. > > Required patches: > > sched-prevent-high-load-weight-tasks-suppressing-balancing.patch > sched-improve-stability-of-smpnice-load-balancing.patch > > Note: This patch makes no change to load balancing in the case where > all tasks are nice==0. > > Signed-off-by: Peter Williams <pwil3058@bigpond.com.au>
Acked-by: Ingo Molnar <mingo@elte.hu>
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