[Freeswitch-users] What FS is doing when idle?

FS (r16858) consumes 4-5% of CPU time with spikes to 10% when idle. No single SIP request hits it. What does it doing? I unloaded all modules which can be unloaded, no difference. Tried with both -vm and -heavy-timer start up options. I'm running gentoo linux. # uname -a Linux 2.6.28-tuxonice-r10 #1 SMP Sat Oct 17 08:58:15 EDT 2009 i686 Intel(R) Pentium(R) 4 CPU 2.80GHz GenuineIntel GNU/Linux