Debian系统更新内核支持bigmem版本解决认不到4G内存

最近安装了Debian 6.0.1a i3却发现内核没有自动加载上PAE以下命令得知系统装了两条2G的内存条,硬件最大支持64G内存dmidecode -t memory# dmidecode 2.9SMBIOS 2.5 present. Handle 0x1000, DMI type 16, 15 bytesPhysical Memory Array Location: System Board Or Motherboard Use: System Memory Error Correction Type: Multi-bit ECC Maximum Capacity: 65280 MB Error Information Handle: Not Provided Number Of Devices: 8 Handle 0x1100, DMI type 17, 28 bytesMemory Device Array Handle: 0x1000 Error Information Handle: Not Provided Total Width: 72 bits Data Width: 64 bits Size: 2048 MB Form Factor: FB-DIMM Set: 1 Locator: DIMM1 Bank Locator: Not Specified Type: DDR2 FB-DIMM Type Detail: Synchronous Speed: 667 MHz （1.5 ns） Manufacturer: 80CE808980CE Serial Number: 501A024B Asset Tag: 010908 Part Number: M395T5663QZ4-CE65 Handle 0x1101, DMI type 17, 28 bytesMemory Device Array Handle: 0x1000 Error Information Handle: Not Provided Total Width: 72 bits Data Width: 64 bits Size: 2048 MB Form Factor: FB-DIMM Set: 1 Locator: DIMM2 Bank Locator: Not Specified Type: DDR2 FB-DIMM Type Detail: Synchronous Speed: 667 MHz （1.5 ns） Manufacturer: 80CE808980CE Serial Number: 501A01C2 Asset Tag: 010908 Part Number: M395T5663QZ4-CE65 但是通过free命令得到只有3.3G 650） this.width=650;" border=0> 再去之前几台装了Debian 5.0.4 upd 查看free命令得到只有3G 650） this.width=650;" border=0>

对应的内核不一样，得到内存总数也不一样，针对这个问题只能安装个支持4G（bigmem）对应内核版本

由于要安装对应内核版本，所以先查看内核版本root@debian:~/soft# uname -aLinux debian 2.6.32-5-686 #1 SMP Tue Mar 8 21:36:00 UTC 2011 i686 GNU/Linux
2.6.32-5-686这个有32-31与32-35 请注意 为了能搜索更多安装包，先更新一下更新debian源 #Vi /etc/apt/sources.listdeb http://mirrors.163.com/debian lenny main non-free contrib deb http://mirrors.163.com/debian lenny-proposed-updates main contrib non-free deb http://mirrors.163.com/debian-security lenny/updates main contrib non-free deb-src http://mirrors.163.com/debian lenny main non-free contrib deb-src http://mirrors.163.com/debian lenny-proposed-updates main contrib non-free deb-src http://mirrors.163.com/debian-security lenny/updates main contrib non-free 再执行以下几个命令#apt-get update#apt-get upgrade#apt-get dist-upgrade apt-cache search -t squeeze-backports linux-image

linux-headers-2.6.26-1-openvz-686 - Header files for Linux 2.6.26-1-openvz-686linux-headers-2.6.26-1-vserver-686-bigmem - Header files for Linux 2.6.26-1-vserver-686-bigmemlinux-headers-2.6.26-1-vserver-686 - Header files for Linux 2.6.26-1-vserver-686linux-headers-2.6.26-1-xen-686 - Header files for Linux 2.6.26-1-xen-686linux-image-2.6.26-1-486 - Linux 2.6.26 image on x86linux-image-2.6.26-1-686-bigmem - Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4linux-image-2.6.26-1-686 - Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4linux-image-2.6.26-1-amd64 - Linux 2.6.26 image on AMD64linux-image-2.6.26-1-openvz-686 - Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, OpenVZ supportlinux-image-2.6.26-1-vserver-686-bigmem - Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, Linux-VServer supportlinux-image-2.6.26-1-vserver-686 - Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, Linux-VServer supportlinux-image-2.6.26-1-xen-686 - Linux 2.6.26 image on i686, oldstyle Xen supportlinux-image-2.6.32-5-686 - Linux 2.6.32 for modern PCslinux-image-2.6.32-5-686-bigmem - Linux 2.6.32 for PCs with 4GB+ RAMlinux-image-2.6-686 - Linux 2.6 for modern PCs （meta-package）
一直搜索不到以下版本，挺蛋疼的linux-image-2.6.32-5-686-bigmem_2.6.32-31_i386.deb只找到这个版本 linux-image-2.6.32-5-686-bigmem_2.6.32-35_i386.deb而这个版本，系统本身的linux-base （>= 2.6.32-35），所以无奈之下升级到linux-base_2.6.32-35，再安装linux-image-2.6.32-5-686-bigmem_2.6.32-35_i386.deb，之前为什么没想直接升级linux-base，因为升级这个会可能导致一些设备驱动无法兼容导致没加载成功用root用户安装wget http://ftp.cn.debian.org/debian/pool/main/l/linux-2.6/linux-base_2.6.32-35_all.debdpkg -i linux-base_2.6.32-35_all.debwget http://ftp.cn.debian.org/debian/pool/main/l/linux-2.6/linux-image-2.6.32-5-686-bigmem_2.6.32-35_i386.debdpkg -i linux-image-2.6.32-5-686-bigmem_2.6.32-35_i386.deb 或者aptitude install linux-image-2.6.32-5-686-bigmem

新内核加到开机启动菜单
root@debian:/etc# update-grubGenerating grub.cfg ...Found linux image: /boot/vmlinuz-2.6.32-5-686-bigmemFound initrd image: /boot/initrd.img-2.6.32-5-686-bigmemFound linux image: /boot/vmlinuz-2.6.32-5-686Found initrd image: /boot/initrd.img-2.6.32-5-686done

最后重新启动系统
再次检查一下系统版本
root@debian:/etc# uname -aLinux debian 2.6.32-5-686-bigmem #1 SMP Mon Jun 13 05:03:09 UTC 2011 i686 GNU/Linux 再查看root@debian:/etc# free total used free shared buffers cachedMem: 4144028 132564 4011464 0 3696 81800-/+ buffers/cache: 47068 4096960Swap: 5840888 0 5840888

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