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why system showing double vhost-2473? I have installed KVM and created a Guest machine with two interfaces on the Ubuntu-14.04 server. When I keep running the Guest machine, the Host machine showing two vhost-2473 in the $ top command that consuming extra %CPU and %memory. Anyone can explain it why? Attached picture. N.B: I used two bridge networks in this task.

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I think there is not much to explain here as Vhost Architecture by Stefan Hajnoczi covers it so well.

TL;DR:

"vhost ... creates a kernel thread ... to handle I/O events and perform the device emulation."

And the number of devices defines the number of worker threads. So I have usually one, and if I add two more vhost network interfaces I have three then.

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