On Wed, Feb 13, 2008 at 01:53:24PM -0800, H. Peter Anvin wrote: > Graham wrote: > >Hello, > > > >I am wondering whether anyone has looked into which AMD CPUs support > >these instructions. I would think that installing a 486 kernel on an > >AthlonXP, for example, would be quite sub-optimal. > > > >i.e. can you safely enable X86_P6_NOP for other CPUs, such as AMD > >K7/K8, VIA C3/C7, or Efficeon? If not, would it be more sensible to > >avoid using these instructions? > > > >It appears that at least some VIA C3 CPUs do not support these opcodes: > > > >http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=463606#45 > > > > Attached is a C program which tests this.
Via Epia SP8000 (C3) Long NOPs supported: no [EMAIL PROTECTED]:~>cat /proc/cpuinfo processor : 0 vendor_id : CentaurHauls cpu family : 6 model : 9 model name : VIA Nehemiah stepping : 8 Via Epia EN15000 (C7) Long NOPs supported: yes [EMAIL PROTECTED]:~>cat /proc/cpuinfo processor : 0 vendor_id : CentaurHauls cpu family : 6 model : 10 model name : VIA Esther processor 1500MHz stepping : 9 Christian -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
