[Click] Some Doubts

[Eddie Kohler]

Hi Prasanth,

 > What might be the problem ? Also suggest how to overcome it.

Your network drivers don't support polling.  Use FromDevice, or get different 
network cards that do support polling, or implement polling support for the 
drivers you've got.  The main polling-ready drivers are Tulip-based 100-Mb 
Ethernet and Intel's e1000 gigabit driver.  These are shipped with Click, either 
as part of the kernel patch or in drivers/.

 > The following systems have the same hardware components:
 > Please explain why the following two differ (A & B) in their
 > results.

Click's high performance depends on polling.  We are working somewhat on 
improving throughput and latency on interrupt-driven configurations, but it is 
not a high priority.

Eddie


prasanth at iitg.ernet.in wrote:
> hi,
> 
> I have just started working with the latest version
> of click modular router available on the web site.I wish
> to know a few things.Please help me out.
> 
> 1. The installation of the click went on quite smoothly.
> The installation of the configuration file (make-ip-config.pl)
> of the router without polling was successful.
> 
> But, I received the following error when I tried to install
> the configuration file with polling.
> 
> [root at click conf]# /usr/local/sbin/click-install my.click
> 
> my.click:25: While configuring 'PollDevice at 6 :: PollDevice':
>   device `eth0' not pollable, use FromDevice instead
> my.click:36: While configuring 'PollDevice at 15 :: PollDevice':
>   device `eth1' not pollable, use FromDevice instead
> Router could not be initialized!
> 
> What might be the problem ? Also suggest how to overcome it.
> 
> 2.I am using a commercial router tester to test the different
> configurations and had obtained the following results.
> 
> The following systems have the same hardware components:
> Please explain why the following two differ (A & B) in their
> results.
> 
> A. A linux based system (without any trace of click modular
> router in the system) :
> 
> Offered Load (% of theoretical max),Throughput (% of offered load)
> 
> 100.0,  0.00109930444342
> 90.0,  0.001135084224
> 80.0,  0.00095772731626
> 70.0,  0.00153702138124
> 60.0,  0.00358638303977
> 50.0,  0.00666830802059
> 40.0,  0.151154347169
> 30.0,  2.86665786724
> 20.0,  28.5155877194
> 10.0,  99.9476750209
> 
> B.A linux based system, with click UNinstalled in the sysem:
> 
> Offered Load (% of theoretical max),Throughput (% of offered load)
> 
> 100.0,  0.0011113846701
> 90.0,  0.00122144933201
> 80.0,  0.00127696972793
> 70.0,  0.00103200002359
> 60.0,  0.00114666666667
> 50.0,  0.00206400018871
> 40.0,  0.00238528294686
> 30.0,  7.04482410279
> 20.0,  51.8142446091
> 10.0,  100.0
> 
> C.These are the results with click Installed in the system:
> (just for the curious).
> 
> Offered Load (% of theoretical max),Throughput (% of offered load)
> 100.0,  0.00109930444342
> 90.0,  0.00120831552306
> 80.0,  0.00138923094021
> 70.0,  0.00157043483723
> 60.0,  0.00183217384932
> 50.0,  0.00219860872624
> 40.0,  0.00280933325842
> 30.0,  1.47633038343
> 20.0,  39.0616762637
> 10.0,  99.9893356551
> 
> But isn't click expected to give better results ? (or do they
> improve only when polling is done ? )
> 
> My knowledge in this field is very limited and therefore
> request you all to forgive my ignorance.
> 
> Thanking You,
> Prasanth.
> 
> 
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