Katynski, Bogdan wrote: > I noticed a rather poor network guest-guest performance. Have you loaded the vhost-net kernel module? It is a huge lever for network performance. What is the output: $ lsmod | grep vhost_net Here are a couple of references: http://www.linux-kvm.com/content/how-maximize-virtio-net-performance-vhost-net http://lwn.net/Articles/346267/ > Is there any way to get a better network performance? I've read > somewhere on the internet somebody complaining about 22Gbit/s and > here I cannot even reach half of a Gbit. Some kernel / virtio driver > settings I should look at? I know that this is a hard to answer > question but maybe I'm missing something obvious here? Since you haven't mentioned the vhost-net driver I am going to assume that you are not running it. Set that up. Verify that your kvm host configuration is using it. $ ps -ef | grep qemu | grep --color vhost ... vhost=on,vhostfd=21 ... $ ps -ef | grep --color vhost root 9599 2 0 21:51 ? 00:00:00 [vhost-9598] Please let us know how it works out for you. Bob
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