[smokeping-users] Re: Experience with FreeBSD 6.x and Smokeping

[Edinilson J. Santos]

You need to adjust some parameters in your sysctl.conf.
Try something like (in sysctl.conf):
net.inet.ip.maxfragpackets=40
net.inet.ip.maxfragsperpacket=16

and see what happens.

Regards

Edinilson
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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 Abello
Network Engineer
Server Management
vinny at tellurian.com
(973)300-9211 x 125
(973)940-6125 (Direct)
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Tellurian Networks - The Ultimate Internet Connection
http://www.tellurian.com (888)TELLURIAN

"Courage is resistance to fear, mastery of fear - not absence of fear" --  
Mark Twain

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