Messages in this thread | | | Date | Mon, 23 Apr 2007 23:03:41 +0200 | From | Ingo Molnar <> | Subject | Re: [REPORT] cfs-v4 vs sd-0.44 |
| |
* Ingo Molnar <mingo@elte.hu> wrote:
> sorry, i was a bit imprecise here. There is a case where CFS can give > out a 'loan' to tasks. The scheduler tick has a low resolution, so it > is fundamentally inevitable [*] that tasks will run a bit more than > they should, and at a heavy context-switching rates these errors can > add up significantly. Furthermore, we want to batch up workloads. > > So CFS has a "no loans larger than sched_granularity_ns" policy (which > defaults to 5msec), and it captures these sub-granularity 'loans' with > nanosec accounting. This too is a very sane economic policy and is > anti-infationary :-)
at which point i guess i should rename CFS to 'EFS' (the Economic Fair Scheduler)? =B-)
Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |