Problems with netgraph

[Julian Elischer]

Oleksandr Samoylyk wrote:
> Julian Elischer wrote:
>> Oleksandr Samoylyk wrote:
>>> David DeSimone wrote:
>>>> Julian Elischer <julian at elischer.org> wrote:
>>>>> unfortunatly I've been totally  ignoring this thread because it said
>>>>> "trouble with em" in the topic..
>>>>> If you'd said "trouble with mpd" then maybe I'd have looked earlier..
>>>>
>>>> In the poster's defense, the only symptom that started this was this
>>>> info from ps:
>>>>
>>>>   PID USERNAME  THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU 
>>>> COMMAND
>>>>    29 root        1 -68    -     0K    16K CPU5   5 196:41 100.00% 
>>>> em0 taskq
>>>>
>>>> So tracking it down to mpd has been a process of elimination in 
>>>> figuring
>>>> out why packets absorb so much CPU.
>>>>
>>>
>>> Here is a result of profiling:
>>>
>>> http://lists.freebsd.org/pipermail/freebsd-net/2008-May/017901.html
>>>
>>
>>
>>                  0.00        0.00      16/1643247     igmp_input [833]
>>                  0.03        0.01     614/1643247     icmp_input [272]
>>                 93.07       17.27 1642617/1643247     encap4_input [9]
>> [10]    49.8   93.10       17.27 1643247         rip_input [10]
>>                 14.26        0.88  600796/749987      _mtx_lock_sleep 
>> [21]
>>                  0.16        1.70 1643863/1643863     raw_append [93]
>>                  0.00        0.24   36345/176995      _mtx_unlock_sleep
>> [114]
>>                  0.01        0.00 1643863/5117962     jailed [278]
>>                  0.00        0.00    1292/1843        m_copym [666]
>>                  0.00        0.00     676/8214484     m_freem [34]
>>
>>
>>
>> 50% of time in rip_input???
>>
>> that's unexpected.. what is the traffic?
> 
> 
> more than 20k pps

I mean, what KIND of traffic?
I'm surprised it 's calling rip_input().. why is it calling
encap4_input()? (which calls rip_input).. what is the IP protocol
of all these packets?

what does a small snippet of traffic  show?

(tcpdump -i em0 -s0 -e -n -c 64)



>
>> I see no netgraph  in the profile at all.
>> did you statically compile it all in at compile time? (you should if 
>> you want to see it)
>>
> 
> Tried both variants. Now not statically.

make sure it is static and that the netgraph nodes are all compiled 
with -pg




>