[squid-users] aufs and memory usage

Hello.
I am using Squid 2.4.6 Stable6 with Debian 3.0 Woody. Like Duane Wessels
suggested in
http://conferences.oreillynet.com/presentations/os2002/wessels_duane.ppt
I created an ext2 filesystem and chose aufs storage scheme in
/etc/squid.conf
(cache_dir aufs /var/spool/squid 6600 16 256)
Now Squid creates exact 20 processes which fast claim a lot of memory while
the cache is nearly empty (about 80MB used). After 5 days of running each
process took about 10MB of memory.
Currently only 2 users are connected to the proxy because it is for testing
purposes only.
Squidguard is installed to filter the Porn-Content and smb_auth is used for
authentification.
Does someone know if this is normal ? And if not, can i simplay change from
aufs to ufs ?

Greetings
Peter Lustig

configuration:
PIII 450, 256MB Ram, 512MB Swap, 8.5GB IDE HD(6.6GB used for proxycache),
Debian Woody, Squid 2.4.6 Stable6

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