[clue] 32 bit app, 64 bit OS

[Shawn T Perry]

I've had LVM snapshots bork (kernel panic) computers on reboots if they are
too big on 32 bit PAE.  That may be a 32 bit issue instead of a PAE one,
but it still stands.  I had to stick boot 64 bit and nuke the snapshot to
make it happy and bootable again.


Shawn T Perry
Red Mop Computing Services
office: 720-319-7627
cell: 303-881-2623




On Fri, May 25, 2012 at 3:16 PM, Christopher Cross <g1ccross at gmail.com>wrote:

> Even with PAE you are limited to how much RAM a single application can
> use. The kernel has to map different parts of RAM and I have run into
> problems with oomkiller destroying systems with PAE even when not much RAM
> (relative to what is installed) was being used because the system ran out
> of lowmem. PAE with a ton of RAM can be a nightmare.
>
> RHEL had the hugemem kernel that worked well and has fixed my lowmem
> issues in the past but that is gone now because 64 bit is available just
> about everywhere.
>
> I like Linus' take on it
> https://lkml.org/lkml/2007/11/15/423
>
> Christopher Cross
> g1ccross at gmail.com
> (310)536-6392
>
>
>
> On Fri, May 25, 2012 at 2:29 PM, David L. Willson <DLWillson at thegeek.nu>wrote:
>
>> pae kernel gets you all the RAM and most of the speed...
>>
>> --
>> David L. Willson
>> Trainer, Engineer, Enthusiast
>> RHCE Network+ A+ Linux+ LPIC-1 Ubuntu
>> Mobile 720-333-LANS(5267)
>>
>> This is a good time for a r3VOLution.
>>
>> ----- Original Message -----
>> >
>> > > This is what I would do:
>> > >
>> > > Virtualize the whole box, and run it as a guest on the new
>> > > hardware. You'll still get 85-90% of the performance you would
>> > > have gotten with a full 64-bit stack.
>> > >
>> > > Then, if you want that last 10-15%, migrate your data to 64-bit
>> > > applications on the host machine, one at a time.
>> >
>> > The assumption being made here is that your application(s) will not
>> > benefit from more RAM. Which happens to be the number one reason to
>> > move to a 64bit platform.
>> >
>> > Cheers,
>> > Raymond
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>
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