Date: Fri, 27 Oct 2006 17:33:27 +0200 From: Thomas <freebsdlists@bsdunix.ch> To: Harti Brandt <harti@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: paket loss on freebsd router if (b)snmpd is running##SPAM Message-ID: <454226C7.10505@bsdunix.ch> In-Reply-To: <20061027104553.D27619@knop-beagle.kn.op.dlr.de> References: <4541AB5C.2060009@bsdunix.ch> <20061027104553.D27619@knop-beagle.kn.op.dlr.de>
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Hello Harti
Harti Brandt schrieb:
> On Fri, 27 Oct 2006, Thomas wrote:
>
> T>Hello
> T>
> T>I use several 5.4 and 6.1 FBSD machines as router (with quagga). The
> T>average traffic is 300mbit/s (em interfaces with polling enabled). It
> T>works more or less.
> T>
> T>Problem:
> T>If bsnmpd is running and I'm doing a snmpwalk from a remote machine the
> T>router has some significant packet loss. We are talking about 3-15% of
> T>packet loss. It's a simple snmpwalk (ipRouteTable and the interfaces stats).
>
> Does this happen also if you walk only the interface tables? What size is
> your routing table?
The routing table has approx. 200k entries. I've to correct my
statement. I don't walk over the RoutingTable.
It's only an interface table walk (IF-MIB). bsnmpd consumes approx.
6-10% cpu. I already have significant packet loss if bsnmpd is started.
bsnmpd not running:
ping www.switch.ch
--- oreius.switch.ch ping statistics ---
44 packets transmitted, 44 packets received, 0% packet loss
round-trip min/avg/max/stddev = 6.825/7.425/8.007/0.252 ms
zero packet loss.
netstat -w 1 shows no error.
input (Total) output
packets errs bytes packets errs bytes colls
39877 0 34330807 38614 0 34087518 0
45522 0 38730142 44124 0 38424881 0
44671 0 38783909 43455 0 38604698 0
43140 0 36939542 42059 0 36691583 0
43428 0 36858817 42213 0 36700954 0
43748 0 37994949 42687 0 37780190 0
42698 0 36451927 41409 0 36270936 0
38695 0 32184588 37119 0 31791417 0
bsnmpd started:
ping www.switch.ch
--- oreius.switch.ch ping statistics ---
57 packets transmitted, 53 packets received, 7% packet loss
round-trip min/avg/max/stddev = 6.715/12.638/95.183/19.041 ms
7% packet loss.
netstat shows some errors too.
netstat -w 1
input (Total) output
packets errs bytes packets errs bytes colls
33597 0 27508009 32433 0 27344720 0
38204 0 32117848 36950 0 31852251 0
39171 0 33870984 37999 0 33696346 0
32160 0 26825650 31065 0 26591079 0
26915 726 20902878 25771 0 20791170 0
35167 0 29173014 33945 0 28904867 0
33282 370 27478393 32140 0 27297079 0
29738 0 23859586 28464 0 23524984 0
38456 598 31559055 36881 0 31313396 0
34738 0 28088584 33247 0 27743827 0
38193 648 30854513 36657 0 30556948 0
A snmpwalk makes it a bit worse but not much. I already have packet loss
if bsnmpd is just started without any walks.
Regards,
Thomas
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