Re: hyper threading.

[em1897]

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 <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Cc: freebsd-questions@freebsd.org
Sent: Sat, 26 Mar 2005 13:49:53 -0600
Subject: Re: hyper threading.
[EMAIL PROTECTED] 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 <[EMAIL PROTECTED]>
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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