[Click] SimpleQueue Performance issue

[remi.clavier at orange-ftgroup.com]

Thanks for yours answers 
 
I clearly anderstand now...
 
But I have to set the IP ECN bit if the lenght of the queue is greather tha a given value, so I have to write into the packet itself !!!
Perhaps is an idea to only annotate the packet insde the ModifiedQueue and to use a specific element to set ECN bit if packets are annotate...
But in this case, the prosessing of packet occurs... in the 
And I'm affraid that the result will be the same...
 
Thanks

 
________________________________

De : Beyers Cronje [mailto:bcronje at gmail.com] 
Envoyé : mercredi 9 décembre 2009 18:37
À : Roman Chertov
Cc : CLAVIER Remi RD-CORE-LAN; click at pdos.csail.mit.edu
Objet : Re: [Click] SimpleQueue Performance issue


I agree with Roman, that is the expected behaviour. One thing to add, depending on your requirements you might not need to uniquefy the packet. Setting packet annotations do not require a unique packet, either work directly on the packet itself or clone it and set the clone's annotation.

Beyers


On Wed, Dec 9, 2009 at 5:50 PM, Roman Chertov <rchertov at cs.ucsb.edu> wrote:


	remi.clavier at orange-ftgroup.com wrote:
	>
	> I have not anderstant exactly how Simple Queue works.
	> For a specific use, I patch SimpleQueue to add an annotation when the
	> length is greather tha a given value using the packet->uniqueify()
	> function to have a new packet to annotate .When the ModifiedQueue is
	> empty, nothing special happends.
	>
	> But when the Queue contains Packets, the CPU usage grows very quickly
	> and go to 100% when the numbre of packets in the queue becomes higher;
	> When the Queue becomes empty, the CPU usage decrease slowly to a normal
	> value
	>
	> I's a normal behavior for a Simple Queue or is this problem related to
	> my patch?
	
	This is the expected behavior as the router is busy processing packets.
	 If there are no packets to process, then there is no need to consume
	the CPU resources.
	
	Roman
	
	>
	>
	> I use click 1.7 with multithread option.
	>
	> Help will be welcome
	>
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	>
	
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