mbuf usage for an idle machine

From: Giovanni P. Tirloni (gpt_at_tirloni.org)
Date: 08/27/03

  • Next message: hilman firmansyah: "Gif IPTunnel networkA-to-networkB not work" 
    Date: Wed, 27 Aug 2003 00:03:15 -0300
To: freebsd-net@freebsd.org

    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
    _______________________________________________
    freebsd-net@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-net
    To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

  • Next message: hilman firmansyah: "Gif IPTunnel networkA-to-networkB not work"

    Relevant Pages

    • Re: Dummynet low bandwidth simulation
      ... > are you sure you aren't running out of mbufs? ... > netstat -m should tell you. ... with different values and am considering settling at 75ms, queue of 5. ... void )defines f as an array of unspecified size, of pointers to functions that return pointers to functions that return void. ...
      (freebsd-current)
    • mbuf clusters in netstat output is wrong
      ... netstat -m prints some strange current mbufs number. ... 0/3/16896 sfbufs in use ... requests for sfbufs delayed ...
      (freebsd-stable)
    • Re: ipfw: pullup failed
      ... a possibility is that it has run out of mbufs. ... what does netstat -m say? ... > Eugene Grosbein ... To unsubscribe, ...
      (freebsd-net)
    • netstat -m
      ... 41202/41440/518144 mbufs in use: ... 41095/41324/129536 mbuf clusters in use (current/peak/max) ... 54 requests for memory denied ...
      (freebsd-questions)
    • Re: Problem sometimes Freebsd crash
      ... Are you using the kernel that comes with bwmgr or a custom one you built? ... What other options do you have set besides tweaking the mbufs - if you're ... server to 16384, ... If I have enough memory, ...
      (freebsd-isp)