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Old 10-25-2007, 07:30 AM   #1
steinz
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adding ram, but ..


Hi,

I have a HP Proliant BL25p amd blade running RHEL3 update 9. I upgraded the ram from 4g to 16g. When I reboot, I see the new memory count up. In ILO, I see the 16g, but when I do free -m or cat /proc/meminfo, I only see 4g.

I called RedHat and they said that the os should just see the new memory, but it does not.

Does anyone have any additional thoughts? The server is booted to the smp
kernel.

Thanks
Randy
 
Old 10-25-2007, 07:58 AM   #2
steinz
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var/log/message entry

Oct 25 08:39:57 srv1 kernel: BIOS-provided physical RAM map:
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 0000000000100000 - 00000000f57f6800 (usable)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000f57f6800 - 00000000f5800000 (ACPI data)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fdc00000 - 00000000fdc01000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fdc10000 - 00000000fdc11000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fec10000 - 00000000fec11000 (reserved)
Oct 25 08:39:57 srv1 syslog: klogd startup succeeded
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fec20000 - 00000000fec21000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved)
Oct 25 08:39:57 srv1 irqbalance: irqbalance startup succeeded
Oct 25 08:39:57 srv1 kernel: BIOS-e820: 0000000100000000 - 00000003fffff000 (usable)

Oct 25 08:39:57 srv1 kernel: Warning only 4GB will be used.
 
Old 10-25-2007, 08:40 AM   #3
serafean
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Hi, I think your problem might be from the kernel : is it a 32 bit or 64 bit kernel? If it is a 32 bit kernel, do you have suppoort for highmem enabled?
 
Old 10-25-2007, 11:41 AM   #4
osor
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Additionally (in the case of 32-bit), you might check to see if the appropriate HIGHMEM is enabled in your kernel configuration file. For example, from a running kernel, do
Code:
zgrep HIGHMEM64G /proc/config.gz
 
Old 10-26-2007, 07:06 AM   #5
steinz
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the 32bit kernel for the AMD Opteron chip only supports 4gb. I had to switch to the hugemem kernel to go above 4gb.

The kb doc says by doing this I am breaking KMI. I am not sure what that means, but I can now see the extra ram.

Thanks
Randy
 
  


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