I'm also seeing this, under 2.6.11 and again it's spamd as the major
culprit. Restarting spamd every few days seems to free up large amounts of
ram.
tombstone:/# free
total used free shared buffers cached
Mem: 514636 497168 17468 0 57520 54128
-/+ buffers/cache: 385520 129116
Swap: 781304 250976 530328
tombstone:/# /etc/init.d/spamassassin stop
Stopping SpamAssassin Mail Filter Daemon: spamd.
tombstone:/# /etc/init.d/spamassassin start
Starting SpamAssassin Mail Filter Daemon: spamd.
tombstone:/# free
total used free shared buffers cached
Mem: 514636 341100 173536 0 58556 56628
-/+ buffers/cache: 225916 288720
Swap: 781304 173024 608280
I've seen this free up over 300MB of swap.
--David
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