Date: Tue, 4 Apr 2006 22:25:43 +0200 From: "Eric" <ericd@free.fr> To: "Petri Helenius" <pete@he.iki.fi> Cc: Lucas Holt <luke@foolishgames.com>, freebsd-smp@freebsd.org, Mark Kirkwood <markir@paradise.net.nz> Subject: Re: Low perf with smp Message-ID: <008001c65825$f3c27700$65fd24c0@Eric> References: <009301c65418$cc029f30$65fd24c0@Eric><64659004-E643-4044-AAED-076E0CC91977@foolishgames.com><01a901c65493$77ad2740$65fd24c0@Eric><442DC9B6.2090200@paradise.net.nz><442EAA0A.8030704@he.iki.fi> <442F0E1B.9090505@paradise.net.nz><027f01c657f4$0d0a66a0$65fd24c0@Eric> <4432858F.90701@he.iki.fi>
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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@he.iki.fi>
To: "Eric" <ericd@free.fr>
Cc: "Lucas Holt" <luke@foolishgames.com>; <freebsd-smp@freebsd.org>; "Mark
Kirkwood" <markir@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@paradise.net.nz>
>> To: "Petri Helenius" <pete@he.iki.fi>
>> Cc: "Eric" <ericd@free.fr>; <freebsd-smp@freebsd.org>; "Lucas Holt"
>> <luke@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
>>> _______________________________________________
>>> freebsd-smp@freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-smp
>>> To unsubscribe, send any mail to "freebsd-smp-unsubscribe@freebsd.org"
>>>
>>
>>
>
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>
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