>From dmesg: CPU: Before vendor init, caps: 000001bf 00000000 00000000, vendor = 0 Intel Pentium with F0 0F bug - workaround enabled. Intel old style machine check architecture supported. Intel old style machine check reporting enabled on CPU#0. CPU: After vendor init, caps: 000001bf 00000000 00000000 00000000 CPU: After generic, caps: 000001bf 00000000 00000000 00000000 CPU: Common caps: 000001bf 00000000 00000000 00000000 CPU: Intel Pentium 75 - 200 stepping 0b Checking 'hlt' instruction... OK. Looks normal. Let's see /proc/cpuinfo... processor : 0 vendor_id : GenuineIntel cpu family : 5 model : 2 model name : Pentium 75 - 200 stepping : 11 cpu MHz : 132.634 fdiv_bug : no hlt_bug : no f00f_bug : yes coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr mce cx8 bogomips : 264.60 processor : 1 vendor_id : unknown cpu family : 0 model : 0 model name : unknown stepping : 16 cpu MHz : 132.634 fdiv_bug : no hlt_bug : no f00f_bug : yes coma_bug : yes fpu : yes fpu_exception : yes cpuid level : 0 wp : yes flags : fpu vme de pse tsc 3dnow lrti bogomips : 0.02 processor : 2 vendor_id : 00 cpu family : 156 model : 48 model name : stepping : 192 cpu MHz : 132.634 cache size : 0 KB fdiv_bug : yes hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 0 wp : yes flags : fpu de tsc msr pae mce apic pge cmov pat clflush dts ia64 recovery longrun lrti bogomips : 644790.84 processor : 3 vendor_id : L) cpu family : 86 model : 41 model name : 00 stepping : 192 cache size : 0 KB fdiv_bug : no hlt_bug : yes f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1048575 wp : no flags : syscall 3dnowext 3dnow bogomips : 0.00 processor : 4 vendor_id : ))})y)u)p) cpu family : 0 model : 0 model name : u)p) stepping : 0 cpu MHz : 132.634 fdiv_bug : yes hlt_bug : yes f00f_bug : yes coma_bug : yes fpu : no fpu_exception : no cpuid level : 1 wp : no flags : fpu tsc msr pae mce apic pge cmov pat clflush dts ia64 syscall 3dnowext 3dnow recovery lrti cxmmx centaur_mcr bogomips : 0.00 processor : 5 vendor_id : unknown cpu family : 0 model : 0 model name : unknown stepping : 0 fdiv_bug : yes hlt_bug : yes f00f_bug : no coma_bug : yes fpu : no fpu_exception : no cpuid level : 0 wp : no flags : cxmmx k6_mtrr cyrix_arr bogomips : 0.00 processor : 6 vendor_id : unknown cpu family : 0 model : 0 model name : unknown stepping : 0 cache size : 0 KB fdiv_bug : no hlt_bug : yes f00f_bug : no coma_bug : no fpu : no fpu_exception : no cpuid level : 0 wp : no flags : bogomips : 0.00 processor : 7 vendor_id : unknown cpu family : 0 model : 0 model name : unknown stepping : 0 cache size : 515 KB fdiv_bug : no hlt_bug : yes f00f_bug : yes coma_bug : yes fpu : no fpu_exception : no cpuid level : 0 wp : no flags : bogomips : 644464.70 Wow! That's pretty impressive, a new kernel build gives me an additional _7_ CPUs! Interesting bits of .config: CONFIG_M586TSC=y CONFIG_X86_MSR=y CONFIG_X86_CPUID=y CONFIG_NOHIGHMEM=y # CONFIG_HIGHMEM4G is not set # CONFIG_HIGHMEM64G is not set # CONFIG_MATH_EMULATION is not set CONFIG_MTRR=y # CONFIG_SMP is not set # CONFIG_X86_UP_APIC is not set # CONFIG_X86_UP_IOAPIC is not set Won't compile with UP APIC turned on, as others have noted. Aside from /bin/ps getting confused about the system capabilities, it seems stable. --Dan