Re: PAE or not PAE?
- Date: Mon, 12 Mar 2018 20:34:30 +0100
- From: Pascal Hambourg <pascal@xxxxxxxxxxxxxxx>
- Subject: Re: PAE or not PAE?
Le 12/03/2018 à 20:04, Pascal Hambourg a écrit :
Le 12/03/2018 à 12:31, Neo a écrit :
You just need this on 32bit machines with more than 4GB of RAM.
No, you also need it on machines with 4 GiB of RAM and remapping
capability, in order to use the part of the RAM which is remapped beyond
the 4-GiB boundary due to the "PCI hole". Usually the remapped memory
amount is about 500 MB, but I have seen machines remapping 1 GiB or even
2 GiB, leaving only 2 or 3 GiB of usable RAM with a non PAE kernel.
Note that the non PAE kernel in older Debian versions up to Jessie
lacked multi-processor (including multi-core and hyper-threading) support.
I forgot to mention that the NX/XD bit used by the "execute disable"
protection against execution of data pages is available only with PAE.