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Date:      Sat, 14 Dec 2002 14:36:39 -0800 (PST)
From:      Josh Brooks <user@mail.econolodgetulsa.com>
To:        freebsd-questions@freebsd.org
Subject:   NMBCLUSTERS over 4096 dangerous in any way ?
Message-ID:  <20021214143213.E77087-100000@mail.econolodgetulsa.com>

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Hi,

I have a firewall that is starting to get a little overworked.  I
currently have this line in my kernel config:

options NMBCLUSTERS=4096

and I am starting to hit that limit:

276/4096/4096 mbuf clusters in use (current/peak/max)

So, the obvious response is to increase that NMBCLUSTERS value.

-----

However, in all the examples and discussion I have seen, I have never seen
anyone discuss raising it above 4096.  I have no indication that raising
it to ... say ... 8192 would be dangerous/risky, but I think I should ask
just to make sure.

The system is a P3-600 with 256 megs physical ram, and 128 megs swap.
This system has no other duties than firewalling.  System is running
4.4-RELEASE.

SO:

1. any comments on raising NMBCLUSTERS to 8192 ?  any other values that
need to be tuned to support that ?

2. what is the max I could safely raise NMBCLUSTERS to ?


thanks!


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