I'm using lighttpd as "file server" on my university project. We are trying to collect as many server parameters as it is possible. So I have a question: is there a possibility to log client download speed? If yes which one: temporary, avg,..?
See Docs_ModAccessLog. You can log high resolution times (e.g. %D) for how long the request took (or begin and end times) as well as the size of the response (%O). Using those, you can calculate average download speeds.