-----Original Message----- From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf Of John Newbigin Sent: Tuesday, April 19, 2005 4:16 PM To: CentOS mailing list Subject: Re: [CentOS] CentOS 4 and Intel P4 without Hyper-Threading vs. IntelP4 with Hyper-Threading I assume you mean by swapping the harddisk to a new box? That should be fine. If you are not already using an SMP kernel then you might want to install it: yum install kernel-smp It is optional but might give you better performance because you can use the HT. John. *************** Thanks John! Yes. That is safe to assume. Yet... Are you saying that the standard stock CentOS 4 kernel does not recognize nor use or take advantage of HT on a stand alone Intel processor and motherboard? This is a 865PERL w/LAN I use for development and testing... ... and that if I upgrade to a SMP kernel on this machine that I will have no problem on a single processor machine/motherboard and HT will then be enabled? I "seem to" recall posts on this list recently where people were "disabling" HT on their multi-processor Intel boxen because of problems. Is this the case as well or were they enabling it. I'll see if I can find out yet if anyone can shed info it would be much appreciated. Basically I am looking at very simple production reliability and testing issues. TIA - rh