Debian系统更新内核支持bigmem版本解决认不到4g内存

zhwz

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 2.9
SMBIOS 2.5 present.

Handle 0x1000, DMI type 16, 15 bytes
Physical 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 bytes
Memory 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 bytes
Memory 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 再查看 root@debian:/etc# free total       used       free     shared    buffers     cached Mem:       4144028    132564    4011464          0       3696      81800 -/+ buffers/cache:      47068    4096960 Swap:      5840888          0    5840888

说明成功了

                                                                      --------viong 2011.09.07 0:22