On 9/14/06, Joseph Miller <[EMAIL PROTECTED]> wrote:
I'm running a terminal server under qemu with kqemu compiled into my kernel under the -kernel-kqemu for fastest performance. What is the most efficient method of -net ? I was using -net user with OpenVPN to connect to my internal LAN, but I have switched to -net tap to see if that is faster. Does anyone have any knowledge of which would take the least overhead? I noticed on my top stats that my % sys was particularly high when using networking under -net user. Thanks
-net tap is considerably more efficient than -net user in most cases. -net user is a TCP/UDP proxy, so (a) your TCP connections are no longer end-to-end, and (b) performance is at the mercy of qemu's internal TCP/IP stack. With -net tap and a bridge, IP packets are passed along unmolested, and all the magic occurs within the host kernel. (Of course where performance is not a pressing issue, -net user is still awfully convenient.) --Ed _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
