Hi Tony, This is the board: http://www.asus.com/products/mb/socket478/p4s533-mx/overview.htm I'm using a 3.06GHz P4 Intel HT socket 478 CPU. I ran this board under SL3 (and acpi on) for months using HT without one hint of a problem. Booting in UP mode shows no issues, booting in SMP mode (without the acpi=off kernel parameter) hangs it everytime. Michael. > Hi Michael; > > Can you give some more details on what mainboard you are using. > This can't be happening on a lot of boards as the FC3 bugzilla > report is a couple of months old and has no follow up activity > except for your comment on RHEL4 doing the same thing. Our Dell > 2650 (which were somewhat notorious for adaptec raid issues with > RHEL3) seems fine with RHEL4. It has two HT Xeons. > > Tony Hoffmann | Tel/Tél: (250) 493-2277 | Fax: (250) 493-7767 > [log in to unmask] <mailto:[log in to unmask]> > National Research Council Canada | P.O. Box 248, Penticton BC V2A 6J9 > Conseil national de recherches Canada | B.P. 248, Penticton (C.-B.) > V2A 6J9 Government of Canada | Gouvernement du Canada > > -----Original Message----- > From: [log in to unmask] > [mailto:[log in to unmask]]On Behalf Of > Michael Mansour > Sent: Monday, April 25, 2005 2:34 PM > To: [log in to unmask] > Subject: Installing SL40 on Hyperthreading CPU > > Hi, > > Most of yesterday I spent time installing SL.40.042005.i386 onto a > couple of my rack systems. One of them uses a Hyperthreading CPU > which I've used under HT mode without issues under SL3. > > However SL40 (aka the vendors newer kernel) has major issues running > in HT mode (UP mode works fine), and just has a hard lock-up during > the boot process, where the only thing that can be done is to press > the power off button. > > I've tracked this down to a bugzilla filed for FC3: > > https://bugzilla.redhat.com/bugzilla-old/show_bug.cgi?id=146921 > > where I get _exactly_ the same issue this guy reported. I disable > the various services where the hard lock-up occurs, and it gets past > them but then on the login prompt, after entering the username and > password the prompt just sits there and you can't login. > > After alot of trouble-shooting on this problem, I tracked it down to > the ACPI support, once I put in: > > acpi=off > > into the kernel grub command line, the system booted and runs fine > in HT mode. From that bugzilla report, it doesn't look like anything > has been fixed with that bug yet. > > On a side note, I also experienced that "kernel openafs anaconda" > problem when burning those ISO's above and installing them onto my > rack servers (the error reported by another guy earlier in this list) > . The way I got round that problem was to do a vanilla "server" > install on selection menu (without specifying the packages I wanted > and didn't want), and SL40 installed, I then went back into the > packages and selected/deselected what I wanted. > > Do I need to download the new ISO's (042505) and re-install these > newly built machines with these ISO's? or is the ISO set I have fine? > > Michael. ------- End of Original Message -------