3GB out of 4GB on RHEL4 U2

Wed Oct 12 11:00:06 UTC 2005

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Article Reference Article ID: 6229
Last update: 09-09-05

Issue: How can I enable all 4GB of installed RAM if I have a Tyan Thunder K8
Motherboard with Opteron CPU(s) and the system only reports 3GB?

Resolution:

This is a result of the way that this motherboard handles PCI and AGP
mapping. Customers have reported success in seeing all 4GB by upgrading to
the latest BIOS release and making the following configuration settings in
the BIOS:

Main > Installed OS > Linux
Advanced > Hammer Config > MTRR Mapping Discrete
Advanced > Hammer Config > Memory Hole > Memhole Mapping > Software
Advanced > Hammer Config > Memory Hole > IOMMU > Enabled

 Nilesh

On 10/11/05, Yuguang Xiong <shrek2099 at yahoo.com> wrote:
>
> Hi All,
>
> I got a Dell Precision Workstation 370 with 4GB
> memory, RHEL4 Update 2 and Pentium4 Hyperthreading
> turned on. In BIOS I can see total 4GB memory
> correctly. But when I booted intoo RHEL, I can only
> see 3GB total memory:
>
> [shrek at integrin downloads]$ free
> total used free shared
> buffers cached
> Mem: 3113776 1548608 1565168 0
> 35508 1190132
> -/+ buffers/cache: 322968 2790808
> Swap: 2096472 0 2096472
>
> and
>
> [shrek at integrin downloads]$ cat /proc/meminfo
> MemTotal: 3113776 kB
> MemFree: 1562912 kB
> Buffers: 35672 kB
> Cached: 1190488 kB
> SwapCached: 0 kB
> Active: 1043660 kB
> Inactive: 422760 kB
> HighTotal: 2226728 kB
> HighFree: 758144 kB
> LowTotal: 887048 kB
> LowFree: 804768 kB
> SwapTotal: 2096472 kB
> SwapFree: 2096472 kB
> Dirty: 160 kB
> Writeback: 0 kB
> Mapped: 828140 kB
> Slab: 36700 kB
> Committed_AS: 748784 kB
> PageTables: 7708 kB
> VmallocTotal: 106488 kB
> VmallocUsed: 42084 kB
> VmallocChunk: 61940 kB
> HugePages_Total: 0
> HugePages_Free: 0
> Hugepagesize: 2048 kB
>
> I tried both kernel versions: kernel-smp-2.6.9-22.EL
> and kernel-hugemem-2.6.9-22.EL, all of them can only
> see 3GB memory.
>
> How to solve this problem so that I can see 4GB total
> memory on my system? Thanks a lot!
>
>
>
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