since

commit 19b7dc3b
Date:   Wed Nov 5 09:08:02 2014 +0000
    changed timers to idles

I'll try and keep the apparent original code intent
to have a shorter time out if there is known
pending work, but that there is much difference
between VCL_IDLE_PRIORITY_LOW of 100 and VCL_IDLE_PRIORITY_LOWEST of
400 in comparison with the original SC_IDLE_MAX of 3000

Change-Id: If87743e24380b6840c67580f246a5e698b6f31a1