conntrack table limits

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Hi,
I'm trying to find out how high I can set conntrack_max on a 2GB 64 bit system. On the net I found different ways of calculating this but they seem to end up with different results. One forumla tells me that I can fit a maximum of 65535 connections into 2GB of RAM but the other says that with 304 bytes per connection (plus a bit of slab allocation overhead) I can easily fit more than a million connections into the table. Also even with the current limit 65535 and the table having ca. 30.000 entries I've almost 1.8GB ram free/cached which leads me to believe the second way of calculating this is more accurate.
What is the proper way to calculate this?

Regards,
  Dennis
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