On Fri, 2006-03-31 at 09:36 -0500, fedora-list-request@xxxxxxxxxx wrote: > Date: Fri, 31 Mar 2006 16:35:55 +0200 > From: Jurgen Kramer <gtm.kramer@xxxxxxxxxxxx> > Subject: Re: NX bit: AMD vs Intel? > To: gilboad@xxxxxxxxx > Cc: For users of Fedora Core releases <fedora-list@xxxxxxxxxx> > Message-ID: <1143815755.3328.10.camel@xxxxxxxxxxxx> > Content-Type: text/plain > > On Fri, 2006-03-31 at 17:09 +0300, Gilboa Davara wrote: > > On Fri, 2006-03-31 at 12:56 +0200, Jurgen Kramer wrote: > > > On my Intel system (Xeon with EMT64 support) which runs the 32-bit > > > version of FC5 I can see that NX support is active (from dmesg): > > > > > > NX (Execute Disable) protection: active > > > > > > On my other system, a AMD64 system running the 64-bit version of FC4, > > > there is no message regarding NX support being enabled of disabled at > > > all. > > > > > > Checking init.c in the kernel sources it seems that NX support is > > > depended on PAE support and NX support from the processor. As the AMD > > > processor supports both I aspect to see a NX procection active message > > > on my AMD system as well. Does NX support suppose to work on 64-bit > > > kernels ? > > > > > > Both systems run kernel 2.6.16. > > > > > > Jurgen > > > > > > > AFAICS, It's activated quietly if present on iAMD64 systems. > > No printk code. > > > > So, if /proc/cpuinfo includes nx, you're in the clear. > > > Yep, nx is there. Odd that it is only displayed on Intel systems. > > Thanks. > > Jurgen > On my system I get the following: cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 4 model name : AMD Athlon(tm) 64 Processor 2800+ stepping : 8 cpu MHz : 800.000 cache size : 512 KB fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow lahf_lm bogomips : 1730.73 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts fid vid ttp Notice I see nx in /proc/cpuinfo. Run this command on your system to see if it shows up... -- ed <ed@xxxxxxxxxx>
