[Users] RE: Trouble getting the 4G (a.k.a. hugemem) patch to work.

[Edward Hibbert]

Thanks for your reply.

I thought the -ent version was built with 4/4?

If not, can I enable it?  How?

Kirill Korotaev wrote:
> default OpenVZ kernel is built with 3GB / 4GB split, not 4/4. for
> compatibility with some old java versions. So user space is limited
> to 3GB as usually. 
> 
> On 4/9/09 4:30 PM, "Edward Hibbert" <Edward.Hibbert at metaswitch.com>
> wrote: 
> 
>> One other bit of info; I'm fairly sure that the 4G patch is built in
>> to the kernel, because I can see this during the boot sequence:
>> 
>> mapped 4G/4G trampoline to fff6d000.
>> So that leaves me baffled as to why I can't get a process above 3G.
>> 
>> 
>> From: Edward Hibbert
>> Sent: 09 April 2009 11:41
>> To: 'users at openvz.org'
>> Subject: Trouble getting the 4G (a.k.a. hugemem) patch to work.
>> 
>> Apologies if this is a dumb FAQ.
>> 
>> I'm trying to get a kernel with what's known in the RedHat world as
>> hugemem, i.e. 4G user space.  I've downloaded a -ent version of the
>> 2.6.18 kernel, and also tried building one myself, but neither of
>> these seems to allow me to exceed 3G.
>> 
>> The source code does seem to have 4G macros in it, and I find it hard
>> to believe that the patch simply doesn't work - so I'm more inclined
>> to think I'm doing something stupid.
>> 
>> Any suggestions?  Yes, yes, I know we should move to 64-bit, but
>> that's not an option right now.
>> 
>> Regards,
>> 
>> Edward.
> 
> 
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