Low perf with smp

[Petri Helenius]

4.x, SMP and performance don't really live in the same box :-)

Pete


Eric wrote:
> Sorry for time to answer, here is result in both  case (with/withou 
> SMP) with freebsd 4.11 :
>
> kern.timecounter.method: 0
> kern.timecounter.hardware: i8254
>
>
> If you want I can do new installation with freebsd 6.0
>
> Thanks,
>
> Eric.
>
>
>
>
> ----- Original Message ----- From: "Mark Kirkwood" 
> <markir at paradise.net.nz>
> To: "Petri Helenius" <pete at he.iki.fi>
> Cc: "Eric" <ericd at free.fr>; <freebsd-smp at freebsd.org>; "Lucas Holt" 
> <luke at foolishgames.com>
> Sent: Sunday, April 02, 2006 1:34 AM
> Subject: Re: Low perf with smp
>
>
>> Petri Helenius wrote:
>>> Mark Kirkwood wrote:
>>>
>>>>
>>>> As I understand it, when you activate SMP a more accurate, but 
>>>> slower timecounter is chosen (typically 'i8254' instead of 'TSC' on 
>>>> intel HW).
>>>
>>>
>>> ACPI-fast should be the default with SMP. It's significantly faster 
>>> than i8254
>>>
>>
>> Yeah - if his Dell has ACPI enabled. However, ACPI-fast is still 
>> slower than say TSC.
>>
>> Eric, do you want to show us the output of
>>
>> $ sysctl kern.timecounter
>>
>> with and without SMP?
>>
>> Cheers
>>
>> Mark
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>
>