Hi,

after adding avg_rt and rss_size fields to carbon graphs I've noticed funny 
thing: avg_rt looks is related to memory usage (or looks like it is), when 
rss_size grows avg_rt also grows, look at the graphs below.

average response time:
http://imageshack.us/photo/my-images/11/avgrt.png/

memory usage:
http://imageshack.us/photo/my-images/831/rsssize.png/

Maybe:
a) stats are wrong, response times are constants, only the time needed for 
metrics gathering grows (?) or other issue related to measuring avg_rt
b) when memory grows uWSGI has more pages to crawl when serving request

App used is just serving static files with --static-index, I use it to test my 
whole setup in real life conditions. I've disabled KSM in vassal config and it 
had no effect. The avg_rt values are small and so it is likly that this is 
measurment error but the behaviour is very stable and happens always after 
restarting vassal. Version used is 1.0.2.1 with carbon patch from #76.
I do not report this as an issue that needs resolving, it's only observation.

Łukasz Mierzwa
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