Even in those examples, it applies mostly to the subset of users who have very large numbers of very simple requests.<p>The ratio of kernel to userland work is bad if you&#x27;re receiving an entire network request just to increment a word in memory but usually quite tolerable if, say, you&#x27;re shoveling video files out and most of the time is spent in something like sendfile() or if your small request actually requires a non-trivial amount of computation.