On Wed, May 17, 2006 at 11:42:43PM +0200, Axel Thimm wrote: > On Wed, May 17, 2006 at 02:07:59PM -0400, Jeremy Katz wrote: > > As we move forward with Xen enablement, there's a desire for > > being able to access more than 4 gigs of RAM on 32-bit Xen hosts. The > > options for handling this are > > 1) Another kernel. This is bad due to > > a) we're running out of CD space already > > b) keeping things matched up between the HV and the guest kernels > > c) migration is worlds of pain with two types of kernels > > 2) Switch the 32-bit xen kernels to require PAE. For most "current" > > non-laptop hardware, this is a non-issue. It does mean that xen won't > > work a lot of earlier PentiumM laptops > > How do I know if my laptop if affected? :) Take a look at the 'flags' field in /proc/cpuinfo - look for a flag called 'pae' in it - if your CPU is a Pentium Mobile the chances are you won't see the 'pae' flag there. For example on my laptop which dosn't have PAE: [berrange@localhost ~]$ grep pae /proc/cpuinfo [berrange@localhost ~]$ While on my desktop, which does have PAE: [berrange@camden berrange]$ grep pae /proc/cpuinfo flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm [berrange@camden berrange]$ Regards, Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|
