[smokeping-users] Re: Experience with FreeBSD 6.x and Smokeping
vinny at tellurian.com
Thu Dec 7 16:40:00 MET 2006
Thanks Edinilson. I will give that a try. I appreciate your help! :)
I'm curious... Smokeping tends to send out fragmented packets? I thought
all the packets were pretty small by default.
Edinilson J. Santos wrote:
> You need to adjust some parameters in your sysctl.conf.
> Try something like (in sysctl.conf):
> and see what happens.
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> ----- Original Message -----
> From: "Vinny Abello" <vinny at tellurian.com>
> To: <smokeping-users at list.ee.ethz.ch>
> Sent: Wednesday, December 06, 2006 4:11 PM
> Subject: [smokeping-users] Experience with FreeBSD 6.x and Smokeping
> Are there many people using FreeBSD 6.x and Smokeping?
> I asked this a while back but nobody seemed to have any input. Ever since
> moving from FreeBSD 5.3 to 6.0 (currently 6.1) I have been seeing artificial
> loss in smokeping that does not exist. It always shows up as two repeated
> intervals of 19/20 packets received (light blue) and never at the same time
> on any of the monitors. I think there is some sort of ICMP rate limiting or
> something else going on in the kernel but I have never been able to locate
> it. Users on the FreeBSD-Stable list didn't have any input either. You can
> clearly see on all of my graphs at the precise time I upgraded from 5.3 to
> 6.0 there is slight loss from that time forward. It makes the graphs that
> are logged for long periods of time look bad (always light blue) instead of
> mostly green which they should be (for my network anyway). I've done
> numerous tests with other tools to verify there is no packet loss from the
> same machine. I cannot reproduce the statistics I see with Smokeping using
> anything else. I'm
> hoping someone might have some input (other than use Linux). :)
> If you need any more information about my setup, just ask. Almost all probes
> are Fping based and there are somewhere between 50 and 60 monitors setup.
> The server is a Dell 2650 with dual P4 Xeon 2.8GHz CPU's. MP kernel is
> enabled. I was toying with disabling MP to see if it was some sort of weird
> problem with multiple CPU's.
> Any help or suggestions are appreciated! :)
vinny at tellurian.com
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