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
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 lenny main non-free contrib
deb lenny-proposed-updates main contrib non-free
deb lenny/updates main contrib non-free
deb-src lenny main non-free contrib
deb-src lenny-proposed-updates main contrib non-free
deb-src 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
，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
dpkg -i linux-base_2.6.32-35_all.deb
wget
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
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