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    SubjectOnly 3.2G ram out of 4G seen in an i386 box
    From
    Hi,
    I have a Dell Optiplex GX280, a Pentium 4 with an Intel chipset. It has
    4G of ram. The problem is I can only see 3.2G, even tho the bios reports
    4G.

    While using debian 2.6.16-2-686:
    thomas@coke:~$ uname -a
    Linux coke 2.6.16-2-686 #1 Sat Jul 15 21:59:21 UTC 2006 i686 GNU/Linux
    thomas@coke:~$ grep MemTotal /proc/meminfo
    MemTotal: 3375484 kB

    This is expected as the standard debian kernels don't set
    CONFIG_HIGHMEM64G. My understanding is that this needs to be set for the
    full 4G to work on i386.

    So I downloaded 2.6.18-rc3-git3 and 2.6.18-rc2-mm1 to give them a try. I
    used the debian config as a starting point for oldconfig. Then from
    menuconfig, "Processor type and featues" -> "High Memory Support" and
    selected 64G. I then compiled both, rebooted and got these results:

    2.6.18-rc2-mm1 reported MemTotal: 3376192 kB
    2.6.18-rc3-git3 reported MemTotal: 3376236 kB

    Is there anything I can do to make use of the 800M or so of ram that's
    unused? Changing to amd64 or anything else that's sane or better does
    not count ;-)

    thomas@coke:~$ cat /proc/cpuinfo
    processor : 0
    vendor_id : GenuineIntel
    cpu family : 15
    model : 3
    model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
    stepping : 4
    cpu MHz : 2992.591
    cache size : 1024 KB
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 3
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pni monitor ds_cpl cid xtpr
    bogomips : 5990.72

    thomas@coke:~$ lspci
    00:00.0 Host bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Express Memory Controller Hub (rev 04)
    00:01.0 PCI bridge: Intel Corporation 915G/P/GV/GL/PL/910GL Express PCI Express Root Port (rev 04)
    00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 03)
    00:1c.1 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 2 (rev 03)
    00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 03)
    00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 03)
    00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 03)
    00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 03)
    00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 03)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d3)
    00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 03)
    00:1f.0 ISA bridge: Intel Corporation 82801FB/FR (ICH6/ICH6R) LPC Interface Bridge (rev 03)
    00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 03)
    00:1f.2 IDE interface: Intel Corporation 82801FB/FW (ICH6/ICH6W) SATA Controller (rev 03)
    00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 03)
    01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]
    01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
    02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express (rev 01)
    thomas@coke:~$

    Regards
    --
    Tom
    (Please CC me as I'm off the list)
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