throttling

I would like to simulate packet delay and loss for UDP and TCP on Linux to measure the performance of an application. Is there a simple way to do this? ephemient netem leverages functionality already built into Linux and userspace utilities to simulate networks. This is actually what Mark's answer refers to, by a different name. The examples on their homepage already show how you can achieve what you've asked for: Examples Emulating wide area network delays This is the simplest example, it just adds a fixed amount of delay to all packets going out of the local Ethernet. # tc qdisc add dev eth0

We're experimenting with various ways to throttle user actions in a given time period : Limit question/answer posts Limit edits Limit feed retrievals For the time being, we're using the Cache to simply insert a record of user activity - if that record exists if/when the user does the same activity, we throttle. Using the Cache automatically gives us stale data cleaning and sliding activity windows of users, but how it will scale could be a problem. What are some other ways of ensuring that requests/user actions can be effectively throttled (emphasis on stability)? Jarrod Dixon Here's a generic