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Date:      Sat, 26 Mar 2005 14:55:52 -0500
From:      em1897@aol.com
To:        racerx@makeworld.com
Cc:        freebsd-questions@freebsd.org
Subject:   Re: hyper threading.
Message-ID:  <8C70054F30E8C8E-A44-3A1E4@mblk-d34.sysops.aol.com>
In-Reply-To: <4245BCE1.6000201@makeworld.com>
References:  <c6ef380c050326061976f164b@mail.gmail.com> <1641928994.20050326192811@wanadoo.fr> <8C700529A2DFD74-A44-3A157@mblk-d34.sysops.aol.com> <4245BCE1.6000201@makeworld.com>

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I am offerring the correct information. Turning on SMP on
an HT machine will kill the systems performance much
more than hyperthreading will gain. I told him to test.
The degradation is easily measurable.

-----Original Message-----
From: Chris <racerx@makeworld.com>
To: em1897@aol.com
Cc: freebsd-questions@freebsd.org
Sent: Sat, 26 Mar 2005 13:49:53 -0600
Subject: Re: hyper threading.

em1897@aol.com wrote:
> This is the kind of disinformation I have been
> referring to....
>
> You'll get much better performance with 1 processor in
> UP mode. I suggest you do some testing.
>
> -----Original Message-----
> From: Anthony Atkielski <atkielski.anthony@wanadoo.fr>
> To: freebsd-questions@freebsd.org
> Sent: Sat, 26 Mar 2005 19:28:11 +0100
> Subject: Re: hyper threading.
>
> Perttu Laine writes:
>
>> I have 3,4ghz ht processor and freebsd shows up only one processors. 
I
>> suppose it should show two in ht models? so, GENERIC kernel doesn't
>> support it? but should I add to kernel config to enable it? by 
reading
>> config examples I think this should be enough:
>>
>> options   SMP
>
>
> Yes, that's all you need.  Just add that line, rebuild and reinstall 
the
> kernel, and you're all set.  Works great.  Hyperthreading doesn't buy
> you as much as truly separate processors, but it helps you get more 
bang
> for the buck out of your single processor (depending on the type of
> workload you run).
>

If you feel someone is in error - feel free to jump in and offer what
you feel to be correct information.

Sometimes sitting back and not correcting someone is far worse then
someone offering information based on what they know, experience, or
what have you.

In this case, by NOT offering the correct information, YOU are just as
much to blame for what you say is going on.

For those of us that don't answer, we either don't know (as is the case
wit myself) OR, they have not had a chance to read the thread.

--
Best regards,
Chris

It is a simple task to make things complex, but a complex
task to make them simple.



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