Re: sched domains kernbench improvements

[Nick Piggin <piggin@cyberone.com.au>]

Con Kolivas wrote:

>On Sat, 28 Feb 2004 22:15, Nick Piggin wrote:
>
>>Con Kolivas wrote:
>>
>>>Hi Nick
>>>
>>>
>>>>So it is more a matter of tuning than anything fundamental
>>>>
>>>Geez I know how you feel... :-D
>>>
>>>
>>>I tried it on the X440 with sched smt disabled
>>>
>>>better than before but still slower than vanilla on half load; however
>>>better than vanilla on optimal and full load now! I wonder whether the
>>>worse result on half load is as relevant since this is 8x HT cpus?
>>>
>>Thanks. Yep the drop off at half load is to be expected with
>>CONFIG_SCHED_SMT turned off.
>>
>
>Will this affect the SCHED_SMT performance and should I do a round of benchies 
>with this enabled?
>
>

It will as far as balancing between physical CPUs, yes. It probably
doesn't make quite a big difference because it is less of a problem
if one sibling goes idle than if one CPU (in the 8-way) goes idle).

But if you could do a round with SCHED_SMT enabled it would be very
nice of you ;)