On 27.09.2013 11:03, Patrick Herzfeld wrote: > Hi > > I'm currenty testing network QoS implementations stumbled upon quite > strange results when using QoS definitions inside the virtdomain xml. > > I'm testing bandwidth from a virtdomain towards a hardware server > connected to the same switch, both connected to gigabit ports. Iperf > tells me the bandwidth is around 939 Mbit/s. > > I added this to my virtdomains xml: > <bandwidth> > <inbound average='1280'/> > <outbound average='1280'/> > </bandwidth> > This should limit the bandwidth to around 10 megabit/s 1280 kilobytes/s, > however i get only around 5.14 Mbits/sec... > > Has anyone an idea what causes this difference? > > I already checked the applied qdisc & class: > > root@testvirt-patrick:~ # tc qdisc sh dev vnet1 > qdisc htb 1: root refcnt 2 r2q 10 default 1 direct_packets_stat 0 > qdisc ingress ffff: parent ffff:fff1 ---------------- SFQ is missing. So I assume you're using and older libvirt (pre 1.0.1). There has been some bugs prior that release ... > root@testvirt-patrick:~ # tc class sh dev vnet1 > class htb 1:1 root prio 0 rate 10240Kbit ceil 10240Kbit burst 1598b > cburst 1598b .. notably in setting these burst and cburst values. Try to update and the problem should get resolved. Michal _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
