New SCHED_SMP diff.

[Jeff Roberson]

On Mon, 2 Jul 2007, Thomas Sparrevohn wrote:

> On Monday 02 July 2007 20:02:41 Jeff Roberson wrote:
>> On Mon, 2 Jul 2007, Thomas Sparrevohn wrote:
>>
>>>
>>
>> Hi, can you try sysctl kern.sched.steal_busy=1?  Please tell me if that
>> improves things.  This will resolve short-term load imbalances by stealing
>> threads from other processors.
>>
>> Thanks,
>> Jeff
>>
>
> If I enable "kern.sched.steal_busy" the system panics within a couple
> of seconds with a "spin lock held to long".
>
> Mind you that the kernels I have use has all debugging turned off e.g.
> no WITHNESS etc. so it could be that - I quite a while if I am to rerun
> all tests with WITHNESS etc enabled - Do you want me to or do you have
> a suggestion as to why it panics?

Hey Thomas, sorry for the bug, can you try the scheduler at:

http://people.freebsd.org/~jeff/sched_smp.c

Thanks,
Jeff

>
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