Synopsis: process swi1:net gives 100% CPU usage.

[Sergey Pronin]

Good day.

As I'm using mpd4 I have mpd.conf and mpd.links. There are lots of static
ngs created. So I'll post just a pattern of my mpd.conf:

pppoe_def:
        set bundle disable multilink
        set bundle disable round-robin
        set bundle enable noretry
        set ipcp dns X.X.X.X Y.Y.Y.Y
        set iface disable on-demand
        set iface disable proxy-arp
        set iface enable tcpmssfix
        set link keep-alive 3 12
#       set link mtu 1300
#        set link mru 1460
        set link max-redial -1
        set pppoe service "*"
        set pppoe enable incoming
        set link enable chap
        set link enable chap-md5
        set link enable chap-msv1
        set link enable chap-msv2
        set link disable passive callback no-orig-auth check-magic
        log -chat -bund -fsm  -pptp
        set iface up-script "/root/scripts/up-script.pl"
        set iface down-script "/root/scripts/down-script.pl"
        set ipcp disable vjcomp
        set auth disable internal
        set auth enable radius-auth
        set radius server Z.Z.Z.Z password 1812 1813
        set radius timeout 10
        set radius retries 3

#ngctl types
There are 27 total types:
      Type name   Number of living nodes
      ---------   ----------------------
          pppoe     144
         socket    2222
          iface    2077
           hole       0
      gif_demux       0
            gif       0
    frame_relay       0
          ether     560
           echo       0
          cisco       0
            vjc       3
            tty       0
            tee       0
         tcpmss     233
         bridge       0
        rfc1490       0
        pptpgre       0
            bpf       0
            ppp    2076
       one2many       0
          async       0
           mppc       0
            lmi       0
             UI       0
           l2tp       0
        ksocket       0
       ip_input       0

I've tried to compile the kernel with and without netgraph options. I
haven't seen any benefit. swi1:net still uses 100% CPU.




I have the same problem with netgraph on 7.1-RELEASE, mpd 5.2, AMD Phenom.
> Dummynet, divert and pf
> are disabled in the kernel.
>
> While swi1:net (aka netgraph) is using 100% of CPU time m_tag_locate() and
> ng_iface_output()
> are constantly called from the infinite loop.
>
> Sergey, could you provide the content of mpd.conf and the output of "ngctl
> types".
>