Hyper threading on a Precision 530 MT

John_Hull@Dell.com John_Hull at Dell.com
Mon Jun 10 10:31:00 CDT 2002


The Hyperthreading feature is only present on the 1.8 GHz Xeon (Prestonia)
processors and above. If the setting is not in the BIOS, then the processor
doesn't have the feature. 

> -----Original Message-----
> From: Marc Mondragon [mailto:Marcmo at RitchieCapital.com]
> Sent: Monday, June 10, 2002 10:05 AM
> To: Matt_Domsch at exchange.dell.com
> Cc: linux-poweredge at exchange.dell.com
> Subject: RE: Hyper threading on a Precision 530 MT
> 
> 
> One more question on this...
> 
> Is the BIOS hyperthreading setting availability controlled by CPU ID?
> 
> I have some 530's with P4 2.2 GHz processors and a couple 
> with what I thought were P4 1.7 GHz processors.  When I do a 
> cat /proc/cpuinfo one the 1.7 processors it show the acpi and 
> ht flags.  But the BIOS does not give me the option of 
> setting hyperthreading on.  I've upgraded the BIOS version so 
> they are all the same and I've turned acpismp=force on but it 
> does not work.
> 
> Any ideas?
> 
> Marc Mondragon
> 
> -----Original Message-----
> From: Matt_Domsch at Dell.com [mailto:Matt_Domsch at Dell.com]
> Sent: Thursday, June 06, 2002 4:33 PM
> To: Marc Mondragon
> Cc: linux-poweredge at dell.com
> Subject: RE: Hyper threading on a Precision 530 MT
> 
> 
> > Is hyper threading not supposed to work on the workstation's?
> 
> It's fairly easy to see if the CPU itself supports 
> hyperthreading.  If so,
> /proc/cpuinfo lists the set of flags for each processor, and 
> included in
> that list will be "ht".  The 2.4.9-21 and above kernels will 
> certainly show
> this if available.  Since you've got the 2.2GHz Xeon CPUs, I 
> believe they
> should.
> 
> Then the BIOS needs to enable HT.  On many systems, it's 
> default is off.
> After power-on, go into BIOS Setup to enable HT.  That would certainly
> explain what you're seeing.
> 
> Then, you already know about the acpismp=force trick to make 
> the kernel
> recognize it for those that don't do it automatically.
> 
> If that doesn't work, come on back and we'll try some more.
> 
> Thanks,
> Matt
> 
> --
> Matt Domsch
> Sr. Software Engineer
> Dell Linux Solutions www.dell.com/linux
> Dell internal Linux lists @ http://insidelists.us.dell.com
> Dell public Linux lists @ http://lists.us.dell.com
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> 
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