Fascinating in a perverse way. The NX (no execute bit) is a tacit concession that Von Neumann architecture is a mistake. Not sure how much performance is lost by using it and even less sure if anybody actually uses it. It may be called something else in the BIOS (perhaps data protection or enhanced virus protection). http://kerneltrap.org/node/3240
Burroughs large systems incorporated an NX like feature in its memory mapping scheme. http://www.groupsrv.com/computers/about487.html I suspect this discussion is academic since Intel's support of the NX bit has not been consistent which could lead to a coding nightmare. I've put this conversation back on the ubuntu-server list, perhaps someone else has wisdom. Jim On Mon, May 10, 2010 at 10:13 PM, Mike.lifeguard <mike.lifegu...@gmail.com>wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 10-05-10 10:49 PM, Jim Tarvid wrote: > > Why not post /proc/cpuinfo and hwinfo --cpu here? You may have talked me > > into investing a little in this box. > > Sure thing: > > mikelifegu...@binnie:~$ cat /proc/cpuinfo > processor : 0 > vendor_id : GenuineIntel > cpu family : 15 > model : 4 > model name : Intel(R) Pentium(R) 4 CPU 3.00GHz > stepping : 1 > cpu MHz : 2992.688 > cache size : 1024 KB > physical id : 0 > siblings : 2 > core id : 0 > cpu cores : 1 > apicid : 0 > initial apicid : 0 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 5 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov > pat > pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs > bts pni dtes64 monitor ds_cpl cid xtpr > bogomips : 5985.37 > clflush size : 64 > cache_alignment : 128 > address sizes : 36 bits physical, 32 bits virtual > power management: > > processor : 1 > vendor_id : GenuineIntel > cpu family : 15 > model : 4 > model name : Intel(R) Pentium(R) 4 CPU 3.00GHz > stepping : 1 > cpu MHz : 2992.688 > cache size : 1024 KB > physical id : 0 > siblings : 2 > core id : 0 > cpu cores : 1 > apicid : 1 > initial apicid : 1 > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 5 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov > pat > pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs > bts pni dtes64 monitor ds_cpl cid xtpr > bogomips : 5985.46 > clflush size : 64 > cache_alignment : 128 > address sizes : 36 bits physical, 32 bits virtual > power management: > > mikelifegu...@binnie:~$ sudo hwinfo --cpu > 01: None 00.0: 10103 CPU > [Created at cpu.304] > Unique ID: rdCR.j8NaKXDZtZ6 > Hardware Class: cpu > Arch: Intel > Vendor: "GenuineIntel" > Model: 15.4.1 "Intel(R) Pentium(R) 4 CPU 3.00GHz" > Features: > > fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,mtrr,pge,mca,cmov,pat,pse36,clflush,dts,acpi,mmx,fxsr,sse,sse2,ss,ht,tm,pbe,constant_tsc,pebs,bts,pni,dtes64,monitor,ds_cpl,cid,xtpr > Clock: 2992 MHz > BogoMips: 5984.79 > Cache: 1024 kb > Units/Processor: 2 > Config Status: cfg=new, avail=yes, need=no, active=unknown > > 02: None 01.0: 10103 CPU > [Created at cpu.304] > Unique ID: wkFv.j8NaKXDZtZ6 > Hardware Class: cpu > Arch: Intel > Vendor: "GenuineIntel" > Model: 15.4.1 "Intel(R) Pentium(R) 4 CPU 3.00GHz" > Features: > > fpu,vme,de,pse,tsc,msr,pae,mce,cx8,apic,mtrr,pge,mca,cmov,pat,pse36,clflush,dts,acpi,mmx,fxsr,sse,sse2,ss,ht,tm,pbe,constant_tsc,pebs,bts,pni,dtes64,monitor,ds_cpl,cid,xtpr > Clock: 2992 MHz > BogoMips: 5985.34 > Cache: 1024 kb > Units/Processor: 2 > Config Status: cfg=new, avail=yes, need=no, active=unknown > > mikelifegu...@binnie:~$ sudo dmidecode -t 4 > # dmidecode 2.9 > SMBIOS 2.31 present. > > Handle 0x0004, DMI type 4, 35 bytes > Processor Information > Socket Designation: WMT478/NWD > Type: Central Processor > Family: Unknown > Manufacturer: GenuineIntel > ID: 41 0F 00 00 FF FB EB BF > Version: Intel(R) Pentium(R) 4 CPU 3.00GHz > Voltage: 1.8 V > External Clock: 100 MHz > Max Speed: 3400 MHz > Current Speed: 3000 MHz > Status: Populated, Enabled > Upgrade: Socket 478 > L1 Cache Handle: 0x0005 > L2 Cache Handle: 0x0006 > L3 Cache Handle: Not Provided > Serial Number: Not Specified > Asset Tag: Not Specified > Part Number: Not Specified > > Thanks for the help, > - -Mike > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (GNU/Linux) > > iEYEARECAAYFAkvovVUACgkQst0AR/DaKHuC2wCgwnY+k4CB6l3g6ikqj5XrTOn7 > KZIAnAm4Um5w2FdZ56QqESOg4iiTAOWt > =XcjA > -----END PGP SIGNATURE----- > -- Rev. Jim Tarvid, PCA Galax, Virginia http://ls.net http://drupal.ls.net http://crossleft.org
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