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: 8Handle 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
再去之前几台装了Debian 5.0.4 upd 查看free命令得到只有3G
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 -a Linux 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.list deb 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-686 linux-headers-2.6.26-1-vserver-686-bigmem – Header files for Linux 2.6.26-1-vserver-686-bigmem linux-headers-2.6.26-1-vserver-686 – Header files for Linux 2.6.26-1-vserver-686 linux-headers-2.6.26-1-xen-686 – Header files for Linux 2.6.26-1-xen-686 linux-image-2.6.26-1-486 – Linux 2.6.26 image on x86 linux-image-2.6.26-1-686-bigmem – Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4 linux-image-2.6.26-1-686 – Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4 linux-image-2.6.26-1-amd64 – Linux 2.6.26 image on AMD64 linux-image-2.6.26-1-openvz-686 – Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, OpenVZ support linux-image-2.6.26-1-vserver-686-bigmem – Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, Linux-VServer support linux-image-2.6.26-1-vserver-686 – Linux 2.6.26 image on PPro/Celeron/PII/PIII/P4, Linux-VServer support linux-image-2.6.26-1-xen-686 – Linux 2.6.26 image on i686, oldstyle Xen support linux-image-2.6.32-5-686 – Linux 2.6.32 for modern PCs linux-image-2.6.32-5-686-bigmem – Linux 2.6.32 for PCs with 4GB+ RAM linux-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.deb dpkg -i linux-base_2.6.32-35_all.deb wget 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.deb dpkg -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-grub Generating grub.cfg … Found linux image: /boot/vmlinuz-2.6.32-5-686-bigmem Found initrd image: /boot/initrd.img-2.6.32-5-686-bigmem Found linux image: /boot/vmlinuz-2.6.32-5-686 Found initrd image: /boot/initrd.img-2.6.32-5-686 done 最后重新启动系统 再次检查一下系统版本 root@debian:/etc# uname -a Linux debian 2.6.32-5-686-bigmem #1 SMP Mon Jun 13 05:03:09 UTC 2011 i686 GNU/Linux root@debian:/etc# free total used free shared buffers cached Mem: 4144028132564 4011464 0 3696 81800 -/+ buffers/cache: 47068 4096960 Swap: 5840888 0 5840888一个积极奋进的目标，一种矢志不渝的追求。
