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´df´ reports strange result

I'm getting my mmc booted system eaten up of something. The 'df' command is consisently reporting a decreased available size although the used size is quite stable.
Here's my output:

Code:

Filesystem           1k-blocks      Used Available Use% Mounted on

/dev/mmcblk0p2            2048      1784       264  87% /mnt/initfs

none                       512        84       428  16% /mnt/initfs/tmp

/dev/mmcblk0p2          669224    555092     80136  87% /

none                       512        84       428  16% /tmp

none                      1024        68       956   7% /dev

The number of blocks & used is not calculating available blocks right.
What's going on? Is it bad blocks on the SD card? I've tried e2fsck without any help... I'm pretty soon going to reach the limit!

Re: ´df´ reports strange result

I suspect that there are plenty files and directoties, e.g in /proc and /sys with 0 kB that actually allocates some space in the memory which will not be included in the used space calculation. I have around 35 MB overhead like that.

The main problem seemed to be the 'wtmp' under /var/log that had grown to over 150 MB. Search 'wtmp' in the forum...