Kashi Venkatesh Vishwanath Amin Vahdat Evaluating Distributed Systems: Does Background Traffic Matter? 227-240 2008 USENIX Annual Technical Conference http://www.usenix.org/events/usenix08/tech/fullpapers/vishwanath/vishwanath.pdf conf/usenix/2008 db/conf/usenix/usenix2008.html#VishwanathV08