CPU selection for ithreads on 8.3

[Navdeep Parhar]

On 05/02/12 14:48, Navdeep Parhar wrote:
> On 05/02/12 14:44, Ryan Stone wrote:
>> On Wed, May 2, 2012 at 5:39 PM, Navdeep Parhar<np at freebsd.org> wrote:
>>> I will try it. But would this explain why it used to work with 8.2 but
>>> broke in 8.3?
>>>
>>> Navdeep
>>
>> If other driver changed between 8.2 and 8.3 to start binding intr
>> threads to CPUs then your driver would inherit the last pinning. Or
>> even if your driver is now attaching after another driver.

ah, ok.  I get it now.  didn't actually read r232757 before replying 
last time.




>
> But wouldn't _all_ of the driver's intr threads inherit the last
> pinning, whatever it was? I'm saying that on 8.2 the 9 different threads
> used to bind to different CPUs automatically (provided enough CPUs were
> available) but now they all bind to the same CPU.
>
> Anyway I'll try out the rev you pointed at then we'll work backwards
> towards an explanation if it works :-)