Re: paket loss on freebsd router if (b)snmpd is running##SPAM
- From: Thomas <freebsdlists@xxxxxxxxxx>
- Date: Fri, 27 Oct 2006 17:33:27 +0200
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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