Ubuntu在64位操作系统上仅检测到3.2GB RAM

可能重复:
在64位系统上仅使用3.2 Gb内存

我一直在运行64位版本的11.10,它从11.04升级,并不是一个全新的安装。 我之前有2GB的RAM,就在今天我增加了4GB的RAM,总共6GB,但只有3.2GB可用。

BIOS检测到它很好并显示6GB。 即使lshw显示6GB内存,但不知何故只有3.2GB可用。

输出uname -a

 ashfame@ashfame-desktop:~$ uname -a Linux ashfame-desktop 3.0.0-13-generic #22-Ubuntu SMP Wed Nov 2 13:27:26 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux 

输出free -m

 ashfame@ashfame-desktop:~$ free -m total used free shared buffers cached Mem: 3268 2304 963 0 134 969 -/+ buffers/cache: 1201 2066 Swap: 2027 0 2027 

输出lshw

 ashfame-desktop description: Desktop Computer product: () width: 64 bits capabilities: smbios-2.4 dmi-2.4 vsyscall64 vsyscall32 configuration: boot=normal chassis=desktop uuid=95649FA0-34EF-11DC-B2FF-000EA6292A3D *-core description: Motherboard product: DG965RY vendor: Intel Corporation physical id: 0 version: AAD41691-301 serial: BTRY728008RN slot: Base Board Chassis Location *-cpu description: CPU product: Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz vendor: Intel Corp. physical id: 0 bus info: cpu@0 version: Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz slot: LGA 775 size: 2GHz capacity: 4GHz width: 64 bits clock: 200MHz capabilities: fpu fpu_exception wp 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 syscall nx x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm cpufreq *-cache:0 description: L2 cache physical id: 1 slot: Unknown size: 2MiB capacity: 2MiB capabilities: asynchronous internal write-back unified *-cache:1 description: L1 cache physical id: 3 slot: Unknown size: 32KiB capacity: 32KiB capabilities: asynchronous internal write-back data *-cache description: L1 cache physical id: 2 slot: Unknown size: 32KiB capacity: 32KiB capabilities: asynchronous internal write-back instruction *-firmware description: BIOS vendor: Intel Corp. physical id: 4 version: MQ96510J.86A.1687.2007.0510.0258 date: 05/10/2007 size: 64KiB capacity: 960KiB capabilities: pci upgrade shadowing cdboot bootselect edd int9keyboard int14serial int17printer int10video acpi usb zipboot biosbootspecification netboot *-memory description: System Memory physical id: 17 slot: System board or motherboard size: 6GiB *-bank:0 description: DIMM DDR2 Synchronous 667 MHz (1.5 ns) product: OCZ2N800SR1G vendor: 0x7F7F7F7FB0000000 physical id: 0 serial: 0xFFFFFFFF slot: J6H1 size: 1GiB width: 64 bits clock: 667MHz (1.5ns) *-bank:1 description: DIMM DDR2 Synchronous 667 MHz (1.5 ns) product: NT2GT64U8HD0BY-AD vendor: Nanya Technology physical id: 1 serial: 0xCB901004 slot: J6H2 size: 2GiB width: 64 bits clock: 667MHz (1.5ns) *-bank:2 description: DIMM DDR2 Synchronous 667 MHz (1.5 ns) product: OCZ2N800SR1G vendor: 0x7F7F7F7FB0000000 physical id: 2 serial: 0xFFFFFFFF slot: J6J1 size: 1GiB width: 64 bits clock: 667MHz (1.5ns) *-bank:3 description: DIMM DDR2 Synchronous 667 MHz (1.5 ns) product: NT2GT64U8HD0BY-AD vendor: Nanya Technology physical id: 3 serial: 0x1B911003 slot: J6J2 size: 2GiB width: 64 bits clock: 667MHz (1.5ns) *-pci description: Host bridge product: 82P965/G965 Memory Controller Hub vendor: Intel Corporation physical id: 100 bus info: pci@0000:00:00.0 version: 02 width: 32 bits clock: 33MHz *-pci:0 description: PCI bridge product: 82P965/G965 PCI Express Root Port vendor: Intel Corporation physical id: 1 bus info: pci@0000:00:01.0 version: 02 width: 32 bits clock: 33MHz capabilities: pci pm msi pciexpress normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:40 ioport:2000(size=4096) memory:e0200000-e02fffff ioport:d0000000(size=268435456) *-display description: VGA compatible controller product: RV770 [Radeon HD 4850] vendor: ATI Technologies Inc physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=fglrx_pci latency=0 resources: irq:50 memory:d0000000-dfffffff memory:e0200000-e020ffff ioport:2000(size=256) memory:e0220000-e023ffff *-multimedia description: Audio device product: HD48x0 audio vendor: ATI Technologies Inc physical id: 0.1 bus info: pci@0000:01:00.1 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list configuration: driver=HDA Intel latency=0 resources: irq:49 memory:e0210000-e0213fff *-communication description: Communication controller product: 82P965/G965 HECI Controller vendor: Intel Corporation physical id: 3 bus info: pci@0000:00:03.0 version: 02 width: 64 bits clock: 33MHz capabilities: pm msi bus_master cap_list configuration: driver=mei latency=0 resources: irq:16 memory:e0326100-e032610f *-network description: Ethernet interface product: 82566DC Gigabit Network Connection vendor: Intel Corporation physical id: 19 bus info: pci@0000:00:19.0 logical name: eth1 version: 02 serial: 00:19:d1:93:ad:2f size: 100Mbit/s capacity: 1Gbit/s width: 32 bits clock: 33MHz capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.3.10-k2 duplex=full firmware=1.1-0 ip=192.168.1.2 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s resources: irq:47 memory:e0300000-e031ffff memory:e0324000-e0324fff ioport:30e0(size=32) *-usb:0 description: USB Controller product: 82801H (ICH8 Family) USB UHCI Controller #4 vendor: Intel Corporation physical id: 1a bus info: pci@0000:00:1a.0 version: 02 width: 32 bits clock: 33MHz capabilities: uhci bus_master configuration: driver=uhci_hcd latency=0 resources: irq:16 ioport:30c0(size=32) *-usb:1 description: USB Controller product: 82801H (ICH8 Family) USB UHCI Controller #5 vendor: Intel Corporation physical id: 1a.1 bus info: pci@0000:00:1a.1 version: 02 width: 32 bits clock: 33MHz capabilities: uhci bus_master configuration: driver=uhci_hcd latency=0 resources: irq:21 ioport:30a0(size=32) *-usb:2 description: USB Controller product: 82801H (ICH8 Family) USB2 EHCI Controller #2 vendor: Intel Corporation physical id: 1a.7 bus info: pci@0000:00:1a.7 version: 02 width: 32 bits clock: 33MHz capabilities: pm debug ehci bus_master cap_list configuration: driver=ehci_hcd latency=0 resources: irq:18 memory:e0325c00-e0325fff *-multimedia description: Audio device product: 82801H (ICH8 Family) HD Audio Controller vendor: Intel Corporation physical id: 1b bus info: pci@0000:00:1b.0 version: 02 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=HDA Intel latency=0 resources: irq:48 memory:e0320000-e0323fff *-pci:1 description: PCI bridge product: 82801H (ICH8 Family) PCI Express Port 1 vendor: Intel Corporation physical id: 1c bus info: pci@0000:00:1c.0 version: 02 width: 32 bits clock: 33MHz capabilities: pci pciexpress msi pm normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:41 ioport:7000(size=4096) memory:e1200000-e13fffff ioport:e1400000(size=2097152) *-pci:2 description: PCI bridge product: 82801H (ICH8 Family) PCI Express Port 2 vendor: Intel Corporation physical id: 1c.1 bus info: pci@0000:00:1c.1 version: 02 width: 32 bits clock: 33MHz capabilities: pci pciexpress msi pm normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:42 ioport:1000(size=4096) memory:e0100000-e01fffff ioport:e1000000(size=2097152) *-ide description: IDE interface product: 88SE6101/6102 single-port PATA133 interface vendor: Marvell Technology Group Ltd. physical id: 0 bus info: pci@0000:03:00.0 logical name: scsi0 version: b1 width: 32 bits clock: 33MHz capabilities: ide pm msi pciexpress bus_master cap_list emulated configuration: driver=pata_marvell latency=0 resources: irq:17 ioport:1018(size=8) ioport:1024(size=4) ioport:1010(size=8) ioport:1020(size=4) ioport:1000(size=16) memory:e0100000-e01001ff *-cdrom description: DVD-RAM writer product: DVD RW AW-G170A vendor: SONY physical id: 0.0.0 bus info: scsi@0:0.0.0 logical name: /dev/cdrom logical name: /dev/cdrw logical name: /dev/dvd logical name: /dev/dvdrw logical name: /dev/scd0 logical name: /dev/sr0 version: 1.62 serial: [ capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram configuration: ansiversion=5 status=nodisc *-pci:3 description: PCI bridge product: 82801H (ICH8 Family) PCI Express Port 3 vendor: Intel Corporation physical id: 1c.2 bus info: pci@0000:00:1c.2 version: 02 width: 32 bits clock: 33MHz capabilities: pci pciexpress msi pm normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:43 ioport:6000(size=4096) memory:e0c00000-e0dfffff ioport:e0e00000(size=2097152) *-pci:4 description: PCI bridge product: 82801H (ICH8 Family) PCI Express Port 4 vendor: Intel Corporation physical id: 1c.3 bus info: pci@0000:00:1c.3 version: 02 width: 32 bits clock: 33MHz capabilities: pci pciexpress msi pm normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:44 ioport:5000(size=4096) memory:e0800000-e09fffff ioport:e0a00000(size=2097152) *-pci:5 description: PCI bridge product: 82801H (ICH8 Family) PCI Express Port 5 vendor: Intel Corporation physical id: 1c.4 bus info: pci@0000:00:1c.4 version: 02 width: 32 bits clock: 33MHz capabilities: pci pciexpress msi pm normal_decode bus_master cap_list configuration: driver=pcieport resources: irq:45 ioport:4000(size=4096) memory:e0400000-e05fffff ioport:e0600000(size=2097152) *-usb:3 description: USB Controller product: 82801H (ICH8 Family) USB UHCI Controller #1 vendor: Intel Corporation physical id: 1d bus info: pci@0000:00:1d.0 version: 02 width: 32 bits clock: 33MHz capabilities: uhci bus_master configuration: driver=uhci_hcd latency=0 resources: irq:23 ioport:3080(size=32) *-usb:4 description: USB Controller product: 82801H (ICH8 Family) USB UHCI Controller #2 vendor: Intel Corporation physical id: 1d.1 bus info: pci@0000:00:1d.1 version: 02 width: 32 bits clock: 33MHz capabilities: uhci bus_master configuration: driver=uhci_hcd latency=0 resources: irq:19 ioport:3060(size=32) *-usb:5 description: USB Controller product: 82801H (ICH8 Family) USB UHCI Controller #3 vendor: Intel Corporation physical id: 1d.2 bus info: pci@0000:00:1d.2 version: 02 width: 32 bits clock: 33MHz capabilities: uhci bus_master configuration: driver=uhci_hcd latency=0 resources: irq:18 ioport:3040(size=32) *-usb:6 description: USB Controller product: 82801H (ICH8 Family) USB2 EHCI Controller #1 vendor: Intel Corporation physical id: 1d.7 bus info: pci@0000:00:1d.7 version: 02 width: 32 bits clock: 33MHz capabilities: pm debug ehci bus_master cap_list configuration: driver=ehci_hcd latency=0 resources: irq:23 memory:e0325800-e0325bff *-pci:6 description: PCI bridge product: 82801 PCI Bridge vendor: Intel Corporation physical id: 1e bus info: pci@0000:00:1e.0 version: f2 width: 32 bits clock: 33MHz capabilities: pci subtractive_decode bus_master cap_list resources: memory:e0000000-e00fffff *-firewire description: FireWire (IEEE 1394) product: TSB43AB22A IEEE-1394a-2000 Controller (PHY/Link) [iOHCI-Lynx] vendor: Texas Instruments physical id: 3 bus info: pci@0000:07:03.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm ohci bus_master cap_list configuration: driver=firewire_ohci latency=32 maxlatency=4 mingnt=2 resources: irq:19 memory:e0004000-e00047ff memory:e0000000-e0003fff *-isa description: ISA bridge product: 82801HB/HR (ICH8/R) LPC Interface Controller vendor: Intel Corporation physical id: 1f bus info: pci@0000:00:1f.0 version: 02 width: 32 bits clock: 33MHz capabilities: isa bus_master cap_list configuration: latency=0 *-storage description: SATA controller product: 82801HB (ICH8) 4 port SATA AHCI Controller vendor: Intel Corporation physical id: 1f.2 bus info: pci@0000:00:1f.2 logical name: scsi1 version: 02 width: 32 bits clock: 66MHz capabilities: storage msi pm ahci_1.0 bus_master cap_list emulated configuration: driver=ahci latency=0 resources: irq:46 ioport:3408(size=8) ioport:3414(size=4) ioport:3400(size=8) ioport:3410(size=4) ioport:3020(size=32) memory:e0325000-e03257ff *-disk description: ATA Disk product: ST3160215AS vendor: Seagate physical id: 0.0.0 bus info: scsi@1:0.0.0 logical name: /dev/sda version: 3.AA serial: 5RX16VWR size: 149GiB (160GB) capabilities: partitioned partitioned:dos configuration: ansiversion=5 signature=00090294 *-volume:0 description: EXT4 volume vendor: Linux physical id: 1 bus info: scsi@1:0.0.0,1 logical name: /dev/sda1 logical name: / version: 1.0 serial: 6c158778-6562-40f5-9f4f-1d49d9d68b13 size: 147GiB capacity: 147GiB capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink extents ext4 ext2 initialized configuration: created=2011-05-01 10:12:11 filesystem=ext4 lastmountpoint=/ modified=2011-11-26 20:37:01 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,user_xattr,acl,barrier=1,data=ordered mounted=2011-11-26 20:37:47 state=mounted *-volume:1 description: Extended partition physical id: 2 bus info: scsi@1:0.0.0,2 logical name: /dev/sda2 size: 2028MiB capacity: 2028MiB capabilities: primary extended partitioned partitioned:extended *-logicalvolume description: Linux swap / Solaris partition physical id: 5 logical name: /dev/sda5 capacity: 2028MiB capabilities: nofs *-serial UNCLAIMED description: SMBus product: 82801H (ICH8 Family) SMBus Controller vendor: Intel Corporation physical id: 1f.3 bus info: pci@0000:00:1f.3 version: 02 width: 32 bits clock: 33MHz configuration: latency=0 resources: memory:e0326000-e03260ff ioport:3000(size=32) 

cat /proc/meminfo输出

 ashfame@ashfame-desktop:~$ cat /proc/meminfo MemTotal: 3346872 kB MemFree: 1152164 kB Buffers: 22152 kB Cached: 871740 kB SwapCached: 320 kB Active: 1355716 kB Inactive: 407872 kB Active(anon): 695948 kB Inactive(anon): 183108 kB Active(file): 659768 kB Inactive(file): 224764 kB Unevictable: 248 kB Mlocked: 248 kB SwapTotal: 2076668 kB SwapFree: 2075652 kB Dirty: 4 kB Writeback: 44 kB AnonPages: 869668 kB Mapped: 195364 kB Shmem: 9360 kB Slab: 88080 kB SReclaimable: 61084 kB SUnreclaim: 26996 kB KernelStack: 3712 kB PageTables: 36956 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 3750104 kB Committed_AS: 3551040 kB VmallocTotal: 34359738367 kB VmallocUsed: 195492 kB VmallocChunk: 34359536360 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 189440 kB DirectMap2M: 3217408 kB 

输出sudo dmidecode – http://pastebin.com/85VBDYmC

尝试使用11.04和11.10的可启动USB并从中启动,只显示3.2GB可用。

根据与fossfreedom的聊天,我尝试取下1GB的棒,只需将新的2GB棒放入其中并从中启动。 该系统仍显示3.2GB的RAM。 我甚至将它们移动到一个通道,但仍显示3.2GB的RAM。

如果它有帮助,1GB棒是来自同一制造商 – Corsair(实际上是双通道存储器套件)和较新的2GB棒来自同一制造商 – 金士顿。

我还建议升级BIOS,但由于它检测到完整的6GB内存,我怀疑它与此有什么关系。 BIOS发行说明没有提到解决问题的任何内容。 这是PDF – http://downloadmirror.intel.com/17520/eng/MQ_1761_ReleaseNotes.pdf (我的BIOS版本 – 1687)

我在BIOS中看到的唯一选项是更改RAM运行的频率和延迟。 截图如下:

在此处输入图像描述

知道这里发生了什么吗?

您的RAM模块与主板兼容,但内存频率是限制因素 – 这就是为什么您只有3.2GB可用于操作系统,800MB是为主板系统图形保留的。

根据英特尔的产品规格页面,您的英特尔主板仅使用DDR2 800 DIMM支持4 GB最大总系统内存

您的lshw输出中列出的两个品牌的RAM模块NT2GT64U8HD0BY-AD和OCZ2N800SR1G的产品编号表明它们是800MHz的PC2-6400模块。

从屏幕截图中可以看出,您的BIOS将内存频率限制在667MHZ,并确实显示它们是800MHz模块。

您可以通过lshw看到安装6GB内存的原因是因为Ubuntu列出了系统上安装的所有硬件 – 而不是正在使用的硬件

为了让您的电路板能够使用更多的RAM,您需要购买额定值为533或667MHZ的模块 – 那么您最多可以使用8GB。