Le 02/08/2016 à 02:28, Stephen Powell a écrit :
On Mon, Aug 1, 2016, at 19:30, Pascal Hambourg wrote:This is really surprising because, according to <https://en.wikipedia.org/wiki/Pentium_M>, Pentium M models which support PAE also support the NX bit. Actually, PAE support was added just to support the NX bit, the physical address size is still 32 bits.You should check your information. :-) That same Wikipedia article that you quoted above also says this: "The Banias family processors internally support PAE but do not show the PAE support flag in their CPUID information ..."
I stand corrected and confused "advertise PAE" with "support PAE".
My original point remains. If one's computer has less than 4 GiB of memory installed, and the processor does not support the XD/NX bit, then running a 32-bit PAE-enabled kernel does not benefit one at all.
Your original point did not mention the NX/XD bit.Also, there can be benefits to use the PAE-enabled kernel provided by Debian which are not related to PAE but to other build options which are not present in the non-PAE kernel :
- support for SMP (hyperthreading or multi-core) - optimizations for the 686 instead of the 586 or older CPUsAt least this has been true up to the current stable version, Jessie. However, it seems that the non-PAE kernel in the next Debian release, Stretch, is built with these options too (and drops support for the 586 CPUs).