The problem was two-sided material (replaced by one-sided ), not supported point light length ( replaced by spot), and sparks made from the one of LED emitter in my coffee machine model ( added node LightmassReplace to avoid bake cause all what is an emitter is used to add the light to the scene by the GPU Light mass).
Bake time 10 min. And I was very surprised when I saw that bake with active Swarm (I have prepared for net bake on CPUs) is made on all machines that have GPU on board in the network.