On 25.02.2009 13:27, Chris Lalancette wrote:
Gerd Hoffmann wrote:
We can also simply do this:
- Install PAE kernel if the CPU supports PAE.
i.e. make PAE the default kernel.
Yes, I really think we should just do this. It's simple, it means we get the
logic right for Xen as well as bare-metal (without any special cases), and the
performance hit for those who have PAE and < 4GB isn't that bad, I don't think
(although numbers one way or the other would be interesting to see).
What about compatibility problems? My old laptop had a PAE capable CPU
but could not boot a PAE kernel -- I noticed when I was trying a PAE
kernel for some tests two or three years ago. I asked a kernel-developer
back then if it was worth reporting and I got told that such problems
are not unusual and often BIOS or hardware problems. Those likely didn't
vanish magically is that statement is correct.
BTW, does anyone know when Windows XP SP2/Vista uses it
PAE-still-limited-to-4gb-kernel to support NX? Maybe we should use a
similar scheme to avoid running into hardware issues.
CU
knurd
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