Date: Wed, 27 Aug 2003 00:03:15 -0300 From: "Giovanni P. Tirloni" <gpt@tirloni.org> To: freebsd-net@freebsd.org Subject: mbuf usage for an idle machine Message-ID: <20030827030314.GJ40033@pixies.tirloni.org>
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Hi,
I've been reading about mbufs and how they're used for
holding network packets and socket buffers and the
output of 'netstat -m' for a idle machine I've here
made me curious about how FreeBSD handles it in -CURRENT.
Why is it using so many mbufs when it's idle? My
small kwnowledge doesn't permit me to answer this
question yet ;)
root@gate:~# netstat -m
mbuf usage:
GEN cache: 0/0 (in use/in pool)
CPU #0 cache: 130/288 (in use/in pool)
Total: 130/288 (in use/in pool)
Mbuf cache high watermark: 512
Maximum possible: 9856
Allocated mbuf types:
130 mbufs allocated to data
2% of mbuf map consumed
mbuf cluster usage:
GEN cache: 0/8 (in use/in pool)
CPU #0 cache: 128/256 (in use/in pool)
Total: 128/264 (in use/in pool)
Cluster cache high watermark: 128
Maximum possible: 4928
5% of cluster map consumed
600 KBytes of wired memory reserved (48% in use)
0 requests for memory denied
0 requests for memory delayed
0 calls to protocol drain routines
root@gate:~# sockstat -4c
USER COMMAND PID FD PROTO LOCAL ADDRESS FOREIGN ADDRESS
bs2 sshd 2085 4 tcp4 192.168.200.1:22 200.200.200.200:1405
root sshd 2082 4 tcp4 192.168.200.1:22 200.200.200.200:1405
root@gate:~# sockstat -4l
USER COMMAND PID FD PROTO LOCAL ADDRESS FOREIGN ADDRESS
root mpd 635 14 tcp4 192.168.200.1:1723 *:*
nobody squid 614 4 udp4 *:49184 *:*
nobody squid 614 20 tcp4 127.0.0.1:3128 *:*
root dhcpd 469 6 udp4 *:67 *:*
root sendmail 432 3 tcp4 127.0.0.1:25 *:*
root sshd 426 3 tcp4 *:22 *:*
root ntpd 407 4 udp4 *:123 *:*
root ntpd 407 5 udp4 192.168.0.254:123 *:*
root ntpd 407 6 udp4 192.168.200.1:123 *:*
root ntpd 407 7 udp4 127.0.0.1:123 *:*
bind named 292 4 udp4 *:49152 *:*
bind named 292 20 udp4 192.168.0.254:53 *:*
bind named 292 21 tcp4 192.168.0.254:53 *:*
bind named 292 22 udp4 127.0.0.1:53 *:*
bind named 292 23 tcp4 127.0.0.1:53 *:*
FreeBSD gate 5.1-CURRENT FreeBSD 5.1-CURRENT #4: Wed Jul 23 \
11:22:55 BRT 2003 root@gate:/usr/src/sys/i386/compile/ \
GATE i386
It has 2 ethernet interfaces (192.168.200.1 and 192.168.0.254)
I'll be happy to provide any additional information if it's
needed.
--
Giovanni P. Tirloni
http://www.tirloni.org
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