Messages in this thread | | | Date | Fri, 25 Sep 2009 16:46:17 -0600 | From | "Chris Friesen" <> | Subject | Re: massive_intr on CFS, BFS, and EDF |
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On 09/25/2009 04:37 PM, Peter Zijlstra wrote: > On Fri, 2009-09-25 at 15:31 -0600, Chris Friesen wrote:
>> Do you allow oversubscription with EDF? It would seem so based on these >> results. Would it maybe make sense to disallow oversubscription, or >> make it an option? > > afaiu he doesn't, he simply splits the task's wcet between parent and > child and (intends?) to feed back on child exit.
How does this work if we have one parent task that forks off a bunch of kids like massive_intr? Does each child get half the bandwidth of the previous child?
> oversubscribing edf isn't in general recommended, iirc u>1 gives > unbounded latencies with edf.
Right...so would it perhaps be more interesting to try a modified test where each child's bandwidth is equal and small enough that there is no oversubscription?
Chris
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