tmpfs and /tmp vs. /dev/shm

[Darin Strait <darin_strait@yahoo.com>]

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I'm running kernel 2.6.2 and I'm experimenting with tmpfs.

I added the following to my fstab:

tmpfs           /tmp            tmpfs   size=50m,mode=1777      0       0


I then rebooted, just to be sure.

kiyone:/etc# mount
/dev/hda1 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/hda3 on /home type ext3 (rw)
tmpfs on /tmp type tmpfs (rw,size=100m,mode=1777)
tmpfs on /dev/shm type tmpfs (rw)
sysfs on /sys type sysfs (rw)
usbfs on /proc/bus/usb type usbfs (rw)

kiyone:/etc# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1             1.9G  1.6G  242M  87% /
/dev/hda3             108G   88G   15G  86% /home
tmpfs                 100M  608K  100M   1% /tmp
tmpfs                 157M     0  157M   0% /dev/shm


Now, I'd noticed the tmpfs filesystem at /dev/shm before. I naively assumed 
that it would evaporate once I modified fstab. Not so.

So, why do I have two tmpfs file systems? 

Which one should my system be using, and how do I get rid of the other one?

- -d
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