At 10:34 PM 6/27/2008, [EMAIL PROTECTED] wrote:
On Sun, 15 Jun 2008 11:16:17 +0100, in sentex.lists.freebsd.net you
wrote:
>Paul wrote:
>> Get these with GRE tunnel on
>> FreeBSD 7.0-STABLE FreeBSD 7.0-STABLE #5: Sun May 11 19:00:57 EDT
>> 2008 :/usr/obj/usr/src/sys/ROUTER amd64
>> But do not get them with 7.0-RELEASE
>>
>> Any ideas what changed? :) Wish there was some sort of changelog..
>> # of messages per second seems consistent with packets per second on
>> GRE interface..
>> No impact in routing, but definitely impact in cpu usage for all
>> processes monitoring the route messages.
>
>RTM_MISS is actually fairly common when you don't have a default route.
>
Hi,
I am seeing this issue as well on a pair of recently deployed
boxes, one running MPD and one acting as an area router in front of
it. The MPD box has a default route and only has 400 routes or so.
A steady stream of those messages, upwards of 500 per second.
got message of size 96 on Fri Jun 27 22:25:42 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0, errno
0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
got message of size 96 on Fri Jun 27 22:25:42 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0, errno
0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
Is there a way to try and track down what is generating those messages
? Its eating up a fair bit of cpu with quagga (the zebra process
specifically)
I narrowed down where the change to RELENG_7 happened. It looks
like a commit around April 22nd caused the behaviour to change.
When a box acting as a router has a packet transit it, an RTM_MISS
is generated for *each packet*...
Given a setup of
H1 ---- R1 ----- H2
where
H1 is 10.10.1.2/24
H2 is 10.20.1.2/24
and
R1 has 2 interfaces, 10.10.1.1/24 and 10.20.1.1/24
Pinging H2 from H1 makes R1 generate a RTM_MISS for each
packet! For routing daemons such as zebra, this eats up a *lot* of
CPU. Turning on ip_fast_forwarding stops this behaviour on
R1. However, if the interface routing the packet is an netgraph
interface (e.g. mpd) fast_forwarding doesnt seem to have an effect
and the RTM_MISS messages are generated again for each packet.
The ping packet below is a valid icmp echo request and reply.
e.g
0[releng7]# ping -c 2 -S 10.20.1.2 10.10.1.2
PING 10.10.1.2 (10.10.1.2) from 10.20.1.2: 56 data bytes
64 bytes from 10.10.1.2: icmp_seq=0 ttl=63 time=0.302 ms
64 bytes from 10.10.1.2: icmp_seq=1 ttl=63 time=0.337 ms
--- 10.10.1.2 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.302/0.320/0.337/0.018 ms
0[releng7]#
generates 4 messages on the router
[r7-router]# route -n monitor
got message of size 96 on Tue Jul 1 00:42:35 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0,
errno 0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
got message of size 96 on Tue Jul 1 00:42:35 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0,
errno 0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
got message of size 96 on Tue Jul 1 00:42:36 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0,
errno 0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
got message of size 96 on Tue Jul 1 00:42:36 2008
RTM_MISS: Lookup failed on this address: len 96, pid: 0, seq 0,
errno 0, flags:<DONE>
locks: inits:
sockaddrs: <DST>
default
I am thinking
http://lists.freebsd.org/pipermail/cvs-src/2008-April/090303.html
is the commit ? If I revert to the prev version, the issue goes away.
kernel is just
0[r7-router]% diff router GENERIC
24,27c24
< ident router
<
< makeoptions MODULES_OVERRIDE="ipfw acpi"
<
---
> ident GENERIC
37,38c34,35
< #options INET6 # IPv6 communications protocols
< #options SCTP # Stream Control
Transmission Protocol
---
> options INET6 # IPv6 communications protocols
> options SCTP # Stream Control
Transmission Protocol
47c44
< #options NFSLOCKD # Network Lock Manager
---
> options NFSLOCKD # Network Lock Manager
61c58
< #options STACK # stack(9) support
---
> options STACK # stack(9) support
303c300
< #device uslcom # SI Labs CP2101/CP2102
serial adapters
---
> device uslcom # SI Labs CP2101/CP2102
serial adapters
---Mike
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