I *think* what has to happen is we need to push out the new cpuspeed that is in SL 5.3 to everyone https://bugzilla.redhat.com/show_bug.cgi?id=459441 http://rhn.redhat.com/errata/RHEA-2009-0098.html Basically, it looks like what happened was the powernow-k8 changes from being built into the kernel to a kernel module. And the cpuspeed needed to be changed to understand this. Can someone test this out and see if it works for them. i386: http://ftp.scientificlinux.org/linux/scientific/5rolling/i386/SL/cpuspeed-1.2.1-5.el5.i386.rpm x86_64: http://ftp.scientificlinux.org/linux/scientific/5rolling/x86_64/SL/cpuspeed-1.2.1-5.el5.x86_64.rpm Troy Dusan Bruncko wrote: > Dear Troy, > > it is true also for i386 ... > > Dusan > > J S Jayakumar wrote: >> Dear Troy, >> >> unfortunately kernel 2.6.18-128.1.1.el5 does not support cpu >> frequency scaling on AMD64 cpus. We were using this feature on all of >> our machines with the previous kernels. Any solution to this problem? >> >> J S Jayakumar -- __________________________________________________ Troy Dawson [log in to unmask] (630)840-6468 Fermilab ComputingDivision/LCSI/CSI DSS Group __________________________________________________