Salmokar,
I followed up with your post on COGL mailing list since I was also curious 
about cogl-batching.Here's  a response from Robert that might help you.
http://lists.freedesktop.org/archives/cogl/2013-February/000956.html
--Mahesh

Date: Wed, 13 Feb 2013 15:35:29 +0530
Subject: clutter batching
From: [email protected]
To: [email protected]

Hello,
While running the ./test-state test within clutter, and exporting 
COGL_DEBUG=batching , i am getting a lot of "len=1" output..
but within this bulk of "len=1" i also get this once in a while..

journal len = 24clip stack batch len = 24 vbo offset batch len =24
and some times len = 48 , 72 etc..

so does that mean that batching is not being performed efficiently(or at all) 
because majority of the times the len =1?and why the len varies from 1 to 24 to 
72 once in a while? what does this actually mean? and is this test case 
suitable for batching..?

I am new to clutter development and help and explanation would benefit.
Thanks,
Kind regards,

Salmokar.

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