I wanted to find something to balance out the n900 I/Os and get a consistently smooth experience. I came across the I/O queue depth parameter nr_requests which is found here:
This parameter is 128 by default. I read Zan Lynx's comment from this website:
http://stackoverflow.com/questions/3...y-is-happening

Then I read a bit more on nr_requests and found this site:
http://yoshinorimatsunobu.blogspot.com/2009/04/linux-io-scheduler-queue-size-and.html

I changed my nr_requests to 100000 and it feels like a balanced system and things are smooth. It's like this is what was missing.

Hope it helps...and don't forget to thank me