<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Henning and Markus,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Thank you for your helpful replies and insights.<o:p></o:p></span></p><p class=MsoNormal style='text-indent:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I did try running the test that I mentioned below (with olsr_switch) for olsrd-0.6.1, and I ran into the following error: “</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Error, cannot aquire [sic] OLSR lock ‘/var/run/olsrd-ipv4.lock’, Another OLSR instance might be running. OLSR EXIT:</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Terminated”<o:p></o:p></span></p><p class=MsoNormal style='text-indent:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So I’m not sure if olsr_switch is compatible with the newer olsrd versions that you listed. As for the seg fault error that I mentioned below, I’m wondering if by simply being more generous in the memory allocation of a few pertinent arrays, I can support more distinct olsrd processes.<o:p></o:p></span></p><p class=MsoNormal style='text-indent:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>At this point, my intention is to see how many distinct olsrd processes can be supported on a single Linux kernel. Ideally I’d like to have 100 distinct olsrd processes running simultaneously on the same kernel; from browsing the olrsd website, it seemed that olsr_switch would be a useful tool for me in that regard.<o:p></o:p></span></p><p class=MsoNormal style='text-indent:.5in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If my proposed bugfix (i.e. more generous memory allocation) doesn’t work, I’ll go with your suggestion of using olsrd-0.6.1 in conjunction with a few VMs. I do see that Xen has been discussed on the mailing list, so that would be a good place for me to start: </span><a href="http://lists.olsr.org/pipermail/olsr-users/2009-April/003389.html">http://lists.olsr.org/pipermail/olsr-users/2009-April/003389.html</a><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Caleb Lo<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> markus.kittenberger@gmail.com [mailto:markus.kittenberger@gmail.com] <b>On Behalf Of </b>Markus Kittenberger<br><b>Sent:</b> Wednesday, December 15, 2010 8:12 PM<br><b>To:</b> Lo, Caleb K.<br><b>Cc:</b> olsr-users@lists.olsr.org<br><b>Subject:</b> Re: [Olsr-users] Scalability of Networks using Olsr_Switch<o:p></o:p></span></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in'>use a newer olsrd version (e.g. 0.6.1 is a current one),. <br>all 0.5.x wasn't very stable, maybe except the latest 0.5.6-Rx<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>(but hmm, i'm not 100% sure if the hemu code is still in 0.6.x)<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>but even 0.5.4 "might" scale to thousands,.. (depending on your cpu and ram limits) they where definitely used (somewhat reliable) in meshes of several hundred nodes,..<br><br>but they are buggy, an will segfault from time to time,.. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Markus<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>p.s what is your goal intention?<o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><div><p class=MsoNormal style='margin-left:.5in'>On Thu, Dec 16, 2010 at 1:22 AM, Lo, Caleb K. <<a href="mailto:clo@mitre.org">clo@mitre.org</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'>Hi everybody,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> I’m running olsrd-0.5.4, and I’m trying to simulate a large network using the olsr_switch application. I’ve tried to set up a large network in host-emulation mode using the instructions in the “Running olsrd in host-emulation mode” section of: <a href="http://www.olsr.org/docs/README-Olsr-Switch.html" target="_blank">http://www.olsr.org/docs/README-Olsr-Switch.html</a><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in'>The command that I used was ”<span style='color:black'>./olsrd -d 1 –hemu 10.0.0.x”, where x ranges from 1 to 17 (inclusive). I’m using the olsrd.conf file that was provided in the tarball from the olsrd website, except that I disabled hysteresis based on the following run-time error that I observed: “Hysteresis and LinkQuality cannot both be active! Deactivate one of them. Bad configuration!”</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in'><span style='color:black'>Using GNU Screen, I started olsr_switch in one window, and then I started (sequentially) olsrd in 17 new windows. When I started the 17<sup>th</sup> olsrd process, I observed the following error on the other processes: “Could not read whole packet (size 51592, read 31848). Segmentation fault”, and they all crashed.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in'><span style='color:black'>Is this a fundamental limitation (in terms of scalability) of olsr_switch, or is this a bug that could be fixed by changing some appropriate constants in the olsr_switch and/or olsr directories?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in;text-indent:.5in'><span style='color:black'>Thank you very much.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in'><span style='color:#888888'>Caleb Lo<o:p></o:p></span></p></div></div><p class=MsoNormal style='margin-left:.5in'><br>--<br>Olsr-users mailing list<br><a href="mailto:Olsr-users@lists.olsr.org">Olsr-users@lists.olsr.org</a><br><a href="http://lists.olsr.org/mailman/listinfo/olsr-users" target="_blank">http://lists.olsr.org/mailman/listinfo/olsr-users</a><o:p></o:p></p></div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div></body></html>