From: Con Spathas (con@spathas.net)
Date: Wed Nov 07 2007 - 20:04:29 ART
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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