5.3-RELEASE on Dell PowerEdge 2850

2004-10-27 Thread Tom Gidden 
Hi,
I've recently got a few Dell PowerEdge 2850 machines with 4 GB RAM to  
build a new database cluster.  However, unlike our existing PowerEdge  
2650 machines, they're only recognising about 3.25 GB.  The machines  
are pretty much standard, with no extra cards (just the built-in  
MegaRAID).

As a last resort, I've tried rebuilding the kernel with  
MAXMEM=(4*1024*1024), which produces some really fun crashes (which I  
can supply if necessary).  The BIOS seems to be devoid of anything  
remotely useful to tweak.

Any ideas?
Here's a dmesg from the non-crashing kernel:  [note, the first line is  
from memory and might be incorrect]

786426K of memory above 4GB ignored
Copyright (c) 1992-2004 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights  
reserved.
FreeBSD 5.3-RELEASE #1: Wed Oct 27 15:39:35 BST 2004
[EMAIL PROTECTED]:/usr/src/sys/i386/compile/PE2850_2
Timecounter i8254 frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2793.01-MHz 686-class CPU)
  Origin = GenuineIntel  Id = 0xf34  Stepping = 4
   
Features=0xbfebfbffFPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE 
,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE
real memory  = 3489398784 (3327 MB)
avail memory = 3418533888 (3260 MB)
ACPI APIC Table: DELL   PE BKC  
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  6
ioapic0: Changing APIC ID to 7
ioapic1: Changing APIC ID to 8
ioapic1: WARNING: intbase 32 != expected base 24
ioapic2: Changing APIC ID to 9
ioapic2: WARNING: intbase 64 != expected base 56
ioapic3: Changing APIC ID to 10
ioapic3: WARNING: intbase 96 != expected base 88
ioapic0 Version 2.0 irqs 0-23 on motherboard
ioapic1 Version 2.0 irqs 32-55 on motherboard
ioapic2 Version 2.0 irqs 64-87 on motherboard
ioapic3 Version 2.0 irqs 96-119 on motherboard


Thanks,
--
Tom Gidden
Lonres.com Limited
t: 020 7924 6622
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Re: 5.3-RELEASE on Dell PowerEdge 2850

2004-10-27 Thread Dan Nelson 
In the last episode (Oct 27), Tom Gidden said:
 I've recently got a few Dell PowerEdge 2850 machines with 4 GB RAM to
 build a new database cluster.  However, unlike our existing PowerEdge
 2650 machines, they're only recognising about 3.25 GB.  The machines
 are pretty much standard, with no extra cards (just the built-in
 MegaRAID).
 
 As a last resort, I've tried rebuilding the kernel with
 MAXMEM=(4*1024*1024), which produces some really fun crashes (which I
 can supply if necessary).  The BIOS seems to be devoid of anything
 remotely useful to tweak.
 
 Any ideas?
 
 Here's a dmesg from the non-crashing kernel:  [note, the first line
 is from memory and might be incorrect]
 
 786426K of memory above 4GB ignored

It looks like you will need to enable PAE to access the rest of that
memory (see the pae manpage; some hardware will not work with it
enabled).  Dell has apparently put quite a bit of your memory past the
4GB point, and left a 700MB hole somewhere in lower memory.  I think if
you do a boot -v, it will print the memory ranges.

-- 
Dan Nelson
[EMAIL PROTECTED]
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