discrepency between "df" and "du" on tmpfs filesystem?

["Christopher Friesen" <cfriesen@nortel.com>]

Someone noticed this on one of our machines.  The rootfs is a 256MB 
tmpfs filesystem.  Depending on how you check the size, you get two 
different answers.


root@10.41.50.66:/root> df -hl
Filesystem            Size  Used Avail Use% Mounted on
rootfs                256M  250M  6.4M  98% /
none                   32M  116K   32M   1% /tmp

root@10.41.50.66:/root> df -kl
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                  262144    255684      6460  98% /
none                     32768       116     32652   1% /tmp

root@10.41.50.66:/root> du -sxk /
204672  /

root@10.41.50.66:/root> du -sxh /
200M    /

Anyone know what's going on?

Chris
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