Date: Tue, 5 Dec 2000 14:18:52 +0100 (CET) From: Ferdinand Goldmann <ferdl@atommuell.oeh.uni-linz.ac.at> To: freebsd-net@freebsd.org Subject: hints on mbuf calculation needed Message-ID: <Pine.BSF.4.21.0012051337280.15517-100000@atommuell.oeh.uni-linz.ac.at>
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Greetings.
I have three questions about the value of NMBCLUSTERS:
- Is there any way to tell in advance how high I need to set this value to
have enough? I.e., I have a machine which does forwarding to a proxy and
firewalling/traffic shaping for about 6-700 clients, no local users -
how high should the value of NMBCLUSTERS be?
Current usage is:
$ netstat -m
748/1360/16384 mbufs in use (current/peak/max):
163 mbufs allocated to data
585 mbufs allocated to packet headers
163/582/4096 mbuf clusters in use (current/peak/max)
1504 Kbytes allocated to network (12% of mb_map in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
This short after a reboot, the value of mbuf clusters rises to ~2000 after
some time.
- Memory consumption: How much memory does one mbuf eat up? I'd like to
have a formula to answer the question "I have 32MB RAM, how many NMBCLUSTERS
can I compile into my kernel until that RAM will be eaten up?"
- What's the difference between 'mbuf' and 'mbuf clusters' *blush*?
Regards,
Ferdinand Goldmann
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