[Qemu-devel] What is the cause of -net socket, mcast bad performance?

[Марк Коренберг]

Hello.

On my PC, tap <--> bridge <--> tap networking gives 600 megbit.

Exactly the same, but -net socket,mcast  gives about 1 megbit (!) I do not understand why. 

In my mind, -net socket,mcast is the same as tap, but ethernet frames are going in much simplier way: instead of 

qemu1 -> /dev/tun -> kernel/bridge -> /dev/tun -> qemu2

in such way:

qemu1 -> qemu2

Does somebody knows, why -net socket,mcast works so slowly?

People said, that VDE performace is like TAP. Why not to make same performace on -net socket,mcast ?

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