Re: [libvirt-users] getting oriented/networking [some success]

I seem to have run into https://bugzilla.redhat.com/show_bug.cgi?id=855640, because when I tried the fix/work-around at the end (comment 11), ethtool -K eth0 gro off, my download speed by speedtest went from undetectable to ~150Mb/s. However, it was not able to connect for the upload test, and so something may still be off. Non-virtual machines can do the upload test, so it's not just a firewall issue. The comment refers to another source for more info, but it seems to be behind a Redhat paywall. Ross ________________________________________ From: Boylan, Ross Sent: Friday, March 20, 2015 11:01 AM To: Dominique Ramaekers; libvirt-users(a)redhat.com Subject: RE: [libvirt-users] getting oriented/networking Thanks very much. Unfortunately, networking is currently so slow as to be non-functional (most operations time out). It's also erratic: I had 2 VM that were close to identical--they were both based on the same disk image--and even when I set the networking the same one was fine and one was very slow. Today I started up the VM that had good networking, and it now has bad networking. Here's one of the network specifications: <interface type='direct'> <mac address='52:54:00:61:7c:dc'/> <source dev='eth1' mode='vepa'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> The one that was originally fast also had a NAT network, and the one that was originally slow was mode bridge before I changed it to vepa, which didn't help. The drivers came from http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/virtio-win-... in the 32 bit windows 7 directory of the iso (host is 64 bit, as is the emulated machine; Windows 7 is 32 bit). I've tried shutting down, removing and reinstalling the network adaptor, and various other things. Ross ________________________________________ From: Dominique Ramaekers [dominique.ramaekers(a)cometal.be] Sent: Thursday, March 19, 2015 11:21 PM To: Boylan, Ross; libvirt-users(a)redhat.com Subject: RE: [libvirt-users] getting oriented/networking Dear Boyland, In collaboration with some of this mailing list users, I had put some effort in optimising the guest settings in function of a windows guest. The libvirt-gui doesn't include these options. You'll have to edit the XML in virsh. This was my conclusion on 15-03-2015 but I added the hugepages tip in this list today. As for networking, I only use or bridged or the default virtual network (NAT), so can't help you more here. Here below, a summary of tips: - Setting video to QXL and the display channel to Spice <video> <model type='qxl' ram='65536' vram='65536' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> - Using HyperV enlightenemt timer <features> <hyperv> <relaxed state='on'/> <vapic state='on'/> <spinlocks state='on' retries='8191'/> </hyperv> <features/> <clock ...> <timer name='hypervclock' present='yes'/> </clock> - Delete the tablet entry in the input section or set the USB-bus to USB2 or USB3 - Use hugepages <memoryBacking> <hugepages/> </memoryBacking> Again thanks Daniel and Andrey. Hope this helps. Grts, Dominique. -----Oorspronkelijk bericht----- Van: Boylan, Ross [mailto:Ross.Boylan@ucsf.edu] Verzonden: vrijdag 20 maart 2015 1:52 Aan: libvirt-users(a)redhat.com Onderwerp: [libvirt-users] getting oriented/networking I've been using virt-manager and kvm with a disk image (as in the raw bits) from a physical windows 7 machine. Initial performance was dreadful, but improved as I switched to virtio and spice. I've been running linux VM's somewhat longer (much longer if you count kvm without libvirt). There are lots of choices exposed by virt-manager. How do I find out what the choices mean, and which are good ones? This was true for the video (resolved by following instructions for spice, though I still wonder what the other settings are for), disks and the network. In particular, I have a choice of lots of interfaces for my network; I picked eth1:macvtap because I wanted to bridge eth1. But there is a "Source Mode" which I left at VEPA, even though Bridged was another choice. But the bridge would already seem implicit in picking a source device of eth1:macvtap. I don't know what "source mode" means. The choices in the GUI seem like some of the options listed under forward on http://libvirt.org/formatnetwork.html; is that a good place to look for clarification. I started a 2nd VM that also used eth1:macvtap (with virtio) and it had almost no network throughput. So maybe I should use some other method? I notice the network manager connection gui allows creation of bridges on the network; should I be using that? I have been reading documentation, but I haven't found either a task-oriented discussion ("to get a windows machine working well, use these options" or "follow these steps") or an easy way to go from the choices in the GUI to a discussion of their meaning. Thanks for any help you can offer. Ross Boylan _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users