large in general (think RTT) for this to make sense, it costs a syscall
and if a delay is used, at least two context switches.

We still capture sessions that do pipe-line avoiding the context switch
in that case, without incurring the syscall overhead.


git-svn-id: http://www.varnish-cache.org/svn/trunk@995 d4fa192b-c00b-0410-8231-f00ffab90ce4