Re: slow kernel when memory = 8G

Michael Heiming wrote:
In comp.os.linux.misc Jean-David Beyer <jeandavid8@xxxxxxxxxxx>:
Vilmos Soti wrote:
Hello,

We have a new box which has 8GB of memory. (Debian 3.1).

[ problems getting the kernel to see/use 8GB properly ]

Something else is wrong. I have a system with two Xeon (hyperthreaded)
processors, an Intel E7501 chip set, and 8 GBytes RAM. It works fine and
takes only a minute or so to boot up. The Xeons are 32-bit processors, but
can address up to 64 GBytes of RAM by clever design that needs OS support.

I am currently running Red Hat Enterprise Linux 3 update 8. This has kernel
2.4.21-47.0.1.ELhugemem. The .config file for this contains, in part,

[ memory related part of kernel .config ]

This is a 32-bit kernel because my machine is 32-bit. A 64-bit kernel would
not run on a machine with a 32-bit processor. The EIDE controllers and the
SCSI controllers are all 32-bit as well. It is the processors and the chip
set that do the mapping so that core-to-core copies are not required in the
kernel. If your motherboard will accept 8 GBytes RAM, the processor(s) and
chip set should allow you to access it all.

Indeed, thx for the information Jean-David!

There is some confusion in this thread, primary because the OP
failed to give sufficient information. Like 'cat /proc/cpuinfo'
and a little mobo (maker/etc) info from 'dmidecode' if he
doesn't have the manual close.

Well, the O.P. certainly could have given a bit more information.

But the fact that his motherboard will take 8 GBytes RAM implies that the
processors and chipset will surely run this. I inferred he got his .config
file wrong, which is why I posted (the relevant parts of) mine.

--
.~. Jean-David Beyer Registered Linux User 85642.
/V\ PGP-Key: 9A2FC99A Registered Machine 241939.
/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 18:10:01 up 14 days, 20:38, 3 users, load average: 4.28, 4.36, 4.20
.

Relevant Pages

  • Re: slow kernel when memory = 8G
    ... [problems getting the kernel to see/use 8GB properly] ... processors, an Intel E7501 chip set, and 8 GBytes RAM. ... thx for the information Jean-David! ...
    (comp.os.linux.misc)
  • Re: [SPAM:]
    ... >>2.6.12 kernel or do I need to build a kernel? ... Unfortunately that is a 32-bit cardbus card ... with a different chip set. ...
    (Debian-User)
  • Re: installing D-Link DWL-650 (16-bit) on sid w/ 2.6.12 kernel
    ... >>2.6.12 kernel or do I need to build a kernel? ... Unfortunately that is a 32-bit cardbus card ... with a different chip set. ...
    (Debian-User)
  • Re: Which PCI Wireless card
    ... >> card uses. ... >> same chip set, check that they are the same versions. ... Others you have to use ndiswrapper which lets you use ... > Also be aware that ndiswrapper now requires a minor kernel patch (with ...
    (Fedora)
  • Re: slow kernel when memory = 8G
    ... We have a new box which has 8GB of memory. ... When we use the original Debian kernel, it works fine, ... processors, an Intel E7501 chip set, and 8 GBytes RAM. ...
    (comp.os.linux.misc)