~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 289G 20G 255G 7% /
tmpfs 956M 0 956M 0% /lib/init/rw
varrun 956M 232K 956M 1% /var/run
varlock 956M 0 956M 0% /var/lock
udev 956M 152K 956M 1% /dev
tmpfs 956M 84K 956M 1% /dev/shm
lrm 956M 2.2M 954M 1% /lib/modules/2.6.28-15-generic/volatile
为什么有两个tmpfs？？
我的fstab
# /etc/fstab: static file system information.
#
# Use 'vol_id --uuid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# / was on /dev/sda1 during installation
UUID=a2cc5c35-3bbe-4f2b-8a5f-a5b038b1bb4f / ext3 noatime,errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=dbad46fe-108b-49c1-a959-409e4b8c8002 none swap sw 0 0
/dev/scd0 /media/cdrom1 udf,iso9660 user,noauto,exec,utf8 0 0
请问怎样修改，才能开机自动挂载tmpfs分区，并显示在桌面上，
怎样将firefox的缓存放在tmpfs分区里面，这样就可以在浏览网页的时候不读写硬盘了。
知道的大大努力告诉一下阿，，别嫌问题太简单，懒得动手
