If I understand correctly how varnish works : - the expiration thread (exp_timer) only checks the root of the binheap (= the oldest object currently in cache) - a worker needing to free some space in the cache will nuke (EXP_NukeOne) the least recently used object (not taking into account lru_timeout) which means : - exp_timer can be "forever" checking a valid/very high ttl content - EXP_Nuke can often nuke valid (medium traffic/high ttl) content, leaving expired (high traffic/low ttl) untouched Am I right ? I yes, shouldn't be better to have exp_timer look deeper ? Jean-François Bustarret WAT - Responsable technique http://www.wat.tv
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