On Fri, Feb 7, 2014 at 10:01 AM, James Harrison <jamesaharrisonuk@xxxxxxxxxxx> wrote: > Hi. > Thanks for the quick reply. > > So what architecture does Red Hat compile its kernels for? Having compiled the Linux Kernel, you must specify target architecture. Is there now a "general cpu" option? Fedora builds for the i686 32-bit architecture, and the x86_64 architecture for 64-bit. Those are the base 32-bit and 64-bit architectures that both Intel and AMD processors support. The differences are in the microarchitecture, not the ISA. > For specific CPU features like virtualisation flags, how do kernels know to report the correct CPU features? Is there a Red Hat patch? CPU features and flags are detected at runtime by the upstream kernel. We don't carry any patches for that. > Regarding the Ubuntu part of my email, Is there anyone out there who knows? I have no idea. Are they simply calling their 64-bit kernels "amd64" instead of x86_64? If so, that is purely a naming thing and they are functionally equivalent on both Intel and AMD CPUs. josh _______________________________________________ kernel mailing list kernel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/kernel
