/etc/modules
nf_conntrack acct=1 hashsize=1048576
Hashsize calc;
HASHSIZE = CONNTRACK_MAX / 8 = RAMSIZE (in bytes) / 131072 = RAMSIZE (in MegaBytes) * 8
HASHSIZE = CONNTRACK_MAX / 8 = RAMSIZE (in bytes) / 131072 / (x / 32)
x= 32 or 64
CONNTRACK_MAX = HASHSIZE * 8
you can see this
http://antmeetspenguin.blogspot.com/2011/01/high-performance-linux-router.html
page.
On 01/25/2011 01:45 PM, Dennis Jacobfeuerborn wrote:
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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