FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Ubuntu > Ubuntu User

 
 
LinkBack Thread Tools
 
Old 10-29-2009, 01:14 PM
Brendan Grainger
 
Default Clarification: Is CONFIG_HIGHMEM64G supposed to be set for 64bit Ubuntu Kernels or not?

Hi All,
We're running Xen enabled Hardy LTS 8.04 on an 8Gb ASUS P5QL VM machine. We are finding that with memory remapping off the OS does not see the whole 8Gb, but with memory remapping on it sees 8Gb. I have no idea really, but I thought that memory remapping only applied to PAE 32bit linux. I've seen various posts regarding the*CONFIG_HIGHMEM64G setting be on in order for Ubuntu to see > 4Gb, but am confused as to whether this applies only to PAE enabled 32bit Ubuntu. Is this setting required for 64 bit ubuntu also? On our build it is not set:
root@?????:/boot# grep CONFIG_HIGHMEM64G config-2.6.24-2*root@?????:/boot#*
I've put the relevant bits of free -m and lshw below.
ThanksBrendan

Further details:
# uname -a:Linux wkr05 2.6.24-25-xen #1 SMP Tue Oct 20 08:47:34 UTC 2009 x86_64 GNU/Linux
# free -m with memory remapping on:# free -m** * * * * * total * * * used * * * free * * shared * *buffers * * cachedMem: * * * * *7833 * * * *350 * * * 7483 * * * * *0 * * * * *5 * * * * 62-/+ buffers/cache: * * * *281 * * * 7551Swap: * * * *12401 * * * * *0 * * *12401
# free -m with memory remapping off:
# free -m** * * * * * total * * * used * * * free * * shared * *buffers * * cachedMem: * * * * *3104 * * * *255 * * * 2848 * * * * *0 * * * * *4 * * * * 60-/+ buffers/cache: * * * *190 * * * 2913Swap: * * * *12401 * * * * *0 * * *12401

# Relevant bit of lshw# lshw
** * *-cpu:0** * * * *product: Intel(R) Core(TM)2 CPU * * * * *6400 *@ 2.13GHz** * * * *vendor: Intel Corp.** * * * *physical id: 1** * * * *bus info: cpu@0** * * * *width: 64 bits** * * * *capabilities: fpu fpu_exception wp de tsc msr pae mce cx8 apic sep mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm** * *-cpu:1** * * * *product: Intel(R) Core(TM)2 CPU * * * * *6400 *@ 2.13GHz** * * * *vendor: Intel Corp.** * * * *physical id: 2** * * * *bus info: cpu@1** * * * *width: 64 bits** * * * *capabilities: fpu fpu_exception wp de tsc msr pae mce cx8 apic sep mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm

*-memory** * * * *description: System Memory** * * * *physical id: 31** * * * *slot: System board or motherboard** * * * *size: 8GiB** * * **-bank:0** * * * * * description: DIMM Synchronous 800 MHz (1.2 ns)** * * * * * product: ModulePartNumber00** * * * * * vendor: Manufacturer00** * * * * * physical id: 0** * * * * * serial: SerNum00** * * * * * slot: DIMM0** * * * * * size: 2GiB** * * * * * width: 64 bits** * * * * * clock: 800MHz (1.2ns)** * * **-bank:1** * * * * * description: DIMM Synchronous 800 MHz (1.2 ns)** * * * * * product: ModulePartNumber01** * * * * * vendor: Manufacturer01** * * * * * physical id: 1** * * * * * serial: SerNum01** * * * * * slot: DIMM1** * * * * * size: 2GiB** * * * * * width: 64 bits** * * * * * clock: 800MHz (1.2ns)** * * **-bank:2** * * * * * description: DIMM Synchronous 800 MHz (1.2 ns)** * * * * * product: ModulePartNumber02** * * * * * vendor: Manufacturer02** * * * * * physical id: 2** * * * * * serial: SerNum02** * * * * * slot: DIMM2** * * * * * size: 2GiB** * * * * * width: 64 bits** * * * * * clock: 800MHz (1.2ns)** * * **-bank:3** * * * * * description: DIMM Synchronous 800 MHz (1.2 ns)** * * * * * product: ModulePartNumber03** * * * * * vendor: Manufacturer03** * * * * * physical id: 3** * * * * * serial: SerNum03** * * * * * slot: DIMM3** * * * * * size: 2GiB** * * * * * width: 64 bits** * * * * * clock: 800MHz (1.2ns)
--
ubuntu-users mailing list
ubuntu-users@lists.ubuntu.com
Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
 

Thread Tools




All times are GMT. The time now is 05:22 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org