Low perf with smp

[Eric]

I know Pete but I downgrad because when installing 6.0 performance was half 
than with 4.11.
I done tests and tests but still have very low perfs. I then downdgrad to 
4.11 to see if it came from hardware or software.
Conclusion is that my test wich is consist of loop of mysql query done by a 
php script take :

             - 32 sec with 4.11 without SMP
            - 54 sec with 4.11 with SMP
            - 62 sec with 6.0 or 6.1 beta 4

That's why actually I'm with 4.11.

If you have any idea how improve perfs with 6.0 it will be a pleasure.
Hardware is new dell 1850 with bi-xeon dualcore 2.8Ghz and scsi 15.000t HDD 
on raid1 perc4si 256Mo  controller.

Eric.


----- Original Message ----- 
From: "Petri Helenius" <pete at he.iki.fi>
To: "Eric" <ericd at free.fr>
Cc: "Lucas Holt" <luke at foolishgames.com>; <freebsd-smp at freebsd.org>; "Mark 
Kirkwood" <markir at paradise.net.nz>
Sent: Tuesday, April 04, 2006 4:41 PM
Subject: Re: Low perf with smp


>
> 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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>>>
>>
>>
>
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