Varnish 2.1.3 nuking objects from cache

[Stefan Pommerening]

Hi,

Until today I thought that when varnish (2.1.3) is nuking objects from cache
(counter n_lru_nuked increasing) the reason must be that the cache is full.

My strange situation is:
- varnish 2.1.3 configured -s file,<fname>,20GB
- monitoring using varnishstat -f sm_balloc, sm_bfree
- ~ 15 GB cache used, ~ 5 GB cache free
- counter n_lru_nuked increasing every now and then
   (not rapidly, but occasionally although cache usage is stable at 
about 75% now)

What else (other than a full cache) can be the reason for objects being 
nuked from cache?
(not expired)

I've read that there was a bug in varnish 2.0.6 with some similar behaviour,
but I am using 2.1.3.

Stefan

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