Years ago I saw a pattern in one of my connection graphs. I was testing hosts on the another subnet that had a older router providing connectivity. There was also an automated backup job of some local file systems, and then batch jobs dispatched 5 nights a week. And that was what stuck out: The pattern changed on Saturday/Sunday night.

Larry Sherman RBS Global Banking & Markets Office: +1 203 618 2515

-----Original Message----- From: wmlist_ext at terra.com.br [mailto:wmlist_ext at terra.com.br] Sent: Wednesday, October 01, 2008 5:12 PM To: hobbit at hswn.dk Subject: Re: [hobbit] interesting patterns in graphs

Hi, If nothing else helps, maybe you can add some debug to look at the numbers before they get dropped in the rrd and so try to confirm or not that's a rrd consolidation characteristic or may be it could be the real net test numbers ... -wm ----------------------- Original Message ----------------------- From: jon at shadowsoft.com (Jon Boede) To: hobbit at hswn.dk

Date: Wed, 01 Oct 2008 12:24:47 -0500 Subject: [hobbit] interesting patterns in graphs

Our ping times occasionally turn up graphs like the attached... It seems to me that this is an artifact of how rrd averages multiple into time "buckets" but I am not quite sure of that... anybody have an opinion as to what causes it?

If the image doesn't come through as an attachment, I've put it up on http://www.email.net/jon/hobbitping.png

Curiously, Jon

To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk

This message (including any attachments) is confidential and/or privileged. It is to be used by the intended recipients only. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are inherently insecure and susceptible to change. The Royal Bank of Scotland Group, plc ("RBS") and its US subsidiaries, and affiliates and subsidiary undertakings, including but not limited to, RBS plc New York and Connecticut Branches, RBS Greenwich Capital Markets, Inc., ABN AMRO Bank N.V. New York and Chicago Branches and, ABN AMRO Inc., Citizens Financial Group, Inc. and RBS Citizens, N.A., shall not be liable for the improper or incomplete transmission of the information contained in this communication or Attachment nor for any delay in its receipt or damage to your system. RBS does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. RBS and its subsidiaries and affiliates do not guarantee the accuracy of any email or attachment, that an email will be received or that RBS or its affiliates and subsidiaries will respond to an email.

RBS makes no representations that any information contained in this message (including any attachments) are appropriate for use in all locations or that transactions, securities, products, instruments or services discussed herein are available or appropriate for sale or use in all jurisdictions, or by all investors or counterparties. Those who utilize this information do so on their own initiative and are responsible for compliance with applicable local laws or regulations.********************************************************************

I have not noticed that sort of pattern in my graphs, but I've noticed that hobbit using hobbitping often records latencies an order of magnitude slower than I see with a command-line ping.

David

Paul van Eldijk wrote:

Jon Boede schreef:

...

Our ping times occasionally turn up graphs like the attached... It seems to me that this is an artifact of how rrd averages multiple into time "buckets" but I am not quite sure of that... anybody have an opinion as to what causes it?

We had the same sort of graphs; after changing grom hobbitping to fping, they disapeared...

Paul

To unsubscribe from the hobbit list, send an e-mail to hobbit-unsubscribe at hswn.dk