Re: SMP on Debian server with Hyperthreading
Yes, BIOS setting is enabled. The ONLY thing that I haven't done is edit
lilo to include the acpismp=force setting. Did you set that to make it
work? Does it work without it (ie. SMP enabled WITHOUT modifying lilo)?
----- Original Message -----
From: "Guus Houtzager" <email@example.com>
Sent: Saturday, 06 September, 2003 5:08 PM
Subject: Re: SMP on Debian server with Hyperthreading
> On Fri, 2003-09-05 at 17:06, Jason Lim wrote:
> > Hi all,
> > Just wondering... I've got a 2.4Ghz Hyperthreading (100% it is the
> > hyperthreading model), and the BIOS sees it.
> I have a 3.06 GHz P4 on an I845G chipset and in the BIOS I had to switch
> the HT option from disabled to enabled. So is it actually on in your
> > I then compiled the kernel... the usual, except added the SMP support
> > setting "Symmetric multi-processing support". Nothing else was
> > Compiled it, liloed it... it's running it:
> > # uname -a
> > Linux megalith 2.4.22 #8 SMP Thu Aug 28 14:44:13 HKT 2003 i686 unknown
> > However,
> That's correct.
> > # mpstat -P
> > Not an SMP machine...
> > And in top i don't see the multiple CPU usage....
> This does work on my setup. I'm running 2.4.22 now, but it worked with
> 2.4.20 aswell.
> > this is all strange. For Linux, aren't Hyperthreading CPUs suppose to
> > like completely separate independent CPUs (this was suppose to change
> > 2.6... but for 2.4, they can't tell the difference, right?).
> > Hope you can advise... as hyperthreading is there but not being used,
> > which is a waste and could add performance.
> My machine is a workstation, so I don't know what would happen with
> typical server software (ie apache, database) but for instance compiling
> a kernel with 3 simultaneous threads is about 20% faster than using only
> 1 thread.
> > Thanks in advance!
> Hope this helps!
> > Jas
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