Hi, I am running a VM in Linux-kvm (kernel 3.6.11-4 ) that uses vhost_net driver for sending/receiving traffic in backend. VM has two ports and the stack running in the VM functions like a simple router that receives packet from one virtual port and simply routes it to other virtual port. In the backend, vhost_net driver does the actual packet handling for VM.
In my routing test, the vhost_net TX path seems to be twice expensive than RX packet. For a 1500 byte packet, "sendmsg" socket call in "handle_tx" routine in "drivers/vhost/net.c" takes almost twice the time than "recvmsg" socket call in "handle_rx" routine sendmsg takes ~12000 cycles recvmsg takes ~6000 cycles Is there any thing wrong? Is there any way to minimize the time taken in sendmsg call? Thanks TS -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
