From: Farhan Anwar (farhan.anwar@gmail.com)
Date: Thu Nov 08 2007 - 08:10:31 ART
hi Ranjith,
A Better Idlepc value means 5 - 15% per Virtual Router, or on the whole
dynamips instance.
Is there a good way to findout idlepc values or after starting the router we
just issue idlepc get command.
Some people say do some configuration and then start idlepc get.
On 11/8/07, Con Spathas <con@spathas.net> wrote:
>
> Oh and just back to the topic at hand Patrick...
>
> Mate - just be warned that your CPU may be okay right now with default
> configs - but wait until you load up some protocols (esp BGP) your CPU
> will
> start to take a hit. If your CPU isn't up to it adjacencies will start
> flapping and causing you more grief!
>
> Just a tip!
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Patrick J Greene
> Sent: Wednesday, 7 November 2007 16:41
> To: Ranjith Samuel; ccielab@groupstudy.com
> Subject: RE: OT: Dynamips Question
>
> Ranjith,
> Thanks for the advice. I can run all 14 instances now and have acceptable
> performance. I am going to suspend 3-4 devices to keep the CPU from
> pegging.
> This also freed up about 300MB of RAM.
>
> Portable Lab, here I come. Now I truly have no excuse for not getting
> rack
> time. :s
>
> Thanks,
> Patrick
>
> From: Ranjith Samuel [mailto:ranjith_samuel@hotmail.com]
> Sent: Wednesday, November 07, 2007 9:14 AM
> To: Patrick J Greene; ccielab@groupstudy.com
> Subject: RE: OT: Dynamips Question
>
> Hello Patrick,
>
> I think the following will help you.
>
> 1) Try to find an image with the smallest size, when unzipped. Try to use
> lower end routers for the Backbones
> 2) Use mmap=false (Really Speeds things up if you have physical memory f
> atleast 2 GB)
> 3) Use GhostIOS feature
> 4) Find the correct idlepc value. Ideally, when the router instance has
> settled down, your cpu should be between 6 - 15 % after applying the
> idlepc
> value
> 5) Dynamips used to crash regularly . So I am using 7 instances now !!!
> Works for me :)
>
> Hope this helps.
>
> Cheers,
>
> Ranjith
>
> > From: patrickg@layer8llc.com
> > To: ccielab@groupstudy.com
> > Date: Wed, 7 Nov 2007 08:50:25 -0500
> > Subject: OT: Dynamips Question
> >
> > I have a laptop with a 1.7Ghz Centrino and 2GB of RAM running bare bones
> XP.
> I was able to bring up the entire IE Lab (14 devices) on 2 Dynamips
> instances but obviously it runs like molasses going uphill in January. The
> CPU stays pegged at 100% and there is still about 125MB of RAM free. I can
> run a browser and wordpad on the laptop without much pain, but when I
> telnet
> to the routers (from another laptop) it is unusable. I do connect but just
> painfully slow.
> >
> > Any performance tuning ideas? I would like to keep the environment on
> > the
> laptop because as a consultant I travel a lot. It's nice to have your lab
> portable.
> >
> > Thanks for the advice.
> >
> > Patrick
> >
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-- Farhan Anwar www.farhananwar.com
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