Avi Kivity wrote: > Hollis Blanchard wrote: >> I'm pleased to report that we now have working network support in the >> guest, via the virtio-net driver. In fact, we can use NFS for the >> guest's root filesystem. :) Boot log attached. >> >> > > Congrats! > >> The bad news is that it's very slow, but the good news is that it's nice >> to be improving performance rather than debugging mysterious >> crashes... ;) >> >> With this milestone reached, in the near future I intend to start >> sending patches to Avi and linuxppc-dev for review, hopefully for >> inclusion in 2.6.26. However, I do want to see if we can improve the >> performance a little bit first... >> > > Low virtio net performance may be due to the virtio net host timer. > What's your guest/host ping latency?
I would be happy about 0.25ms atm :-). The current ping latency to the Host or other PC's is around 7-8ms (native sys is ~0.15ms). We are investigating performance improvements in general and also some changes in the setup e.g. booting from virtio-block as alternative for some speedup. > Even if you have a good hrtimer implementation, I think you'll see > 0.25ms latency, and that may be enough to slow down nfs. Unfortunately > virtio is tuned for throughput at this time (it should be easy to > disable the timer when we detect the queue is usually empty). > -- Grüsse / regards, Christian Ehrhardt IBM Linux Technology Center, Open Virtualization ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
