Kernel panics on PE6450 and memory>4GB

Stephan Wonczak a0033 at rrz.uni-koeln.de
Tue Mar 12 08:13:00 CST 2002


On Tue, 12 Mar 2002, Arjan van de Ven wrote:

> > > >   Hi!
> > > >   I have a problem getting my large memory to work correctly. I am running
> > > > RH 7.2 with a 2.4.9-Kernel. Booting with a vanilla SMP kernel works OK,
> > > > but then it only has ~3.7G memory available; no problem there, this is how
> > > 
> > > which 2.4.9 kernel are you using exactly ?
> > 
> >   At the moment, the kernel 2.4.9-13SGI_XFS_1.0.2enterprise is running.
> 
> Oh so you're not using a RH kernel. 
> (the SGI linux kernels use a compiler known to miscompile 64 bit drivers
> which happens on the bigmem/enterprise kernels a lot)

  This would explain the SGI kernel failing. But see below.

> > But the problem is not with this kernel specifically (in case you are
> > wondering). I can get by without the XFS-Support and use a vanilla 2.4.18,
> > 2.4.9 or even 2.4.7-kernel, but this does not help, either. 
> 
> Which compiler did you use ? gcc 2.96 ? or egcs ?

  gcc 2.96, provided by RH 7.2 disks, and the 2.4.18 tarball from
kernel.org.

> sending the e820 info (the first lines of dmesg) would be most helpful

  Here they are:

Linux version 2.4.18-xfs (root at lvr1.rrz.uni-koeln.de) (gcc version 2.96
20000731 (Red Hat Linux 7.1 2.96-98)) #1 SMP Die Mdr 5 15:57:10 CET 2002
BIOS-provided physical RAM map: 
 BIOS-e820: 0000000000000000 - 00000000000a0000 (usable) 
 BIOS-e820: 0000000000100000 - 00000000dfffe000 (usable) 
 BIOS-e820: 00000000dfffe000 - 00000000e0000000 (reserved) 
 BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) 
 BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved) 
 BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved) 
 BIOS-e820: 0000000100000000 - 0000000200102000 (usable)  
6272MB HIGHMEM available. 
found SMP MP-table at 000fe710
hm, page 000fe000 reserved twice.
hm, page 000ff000 reserved twice.
hm, page 000f0000 reserved twice. 
On node 0 totalpages: 1835008
zone(0): 4096 pages.
zone(1): 225280 pages.
zone(2): 1605632 pages. 


                Dipl. Chem. Stephan Wonczak
		Institut fuer Angewandte Informatik (ZAIK)
                Regionales Rechenzentrum der Universitaet zu Koeln (RRZK)
                Universitaet zu Koeln
                Robert-Koch-Strasse 10
                50931 Koeln
                Tel: ++49/(0)221/478-5577
		Fax: ++49/(0)221/478-5590




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