Have a look if vhost_net is loaded on the guest and if not load it with modeprobe vhost_net Last when doing your lab perf test are you sure that you are not penalised by disk io either in input or outputs Envoyé de mon iPhone > Le 29 févr. 2016 à 17:13, Dominique Ramaekers <dominique.ramaekers@xxxxxxxxxx> a écrit : > > Hi, > > I've got two hosts. Most of my guests are Windows systems. I'm using LANBench to test network performance. > > 1) From an physical PC to a guest (it doesn't matter on which host), I get almost 1Gb/s. They are connected through a 1Gb/s swich => very good! > > 2) From a guest on one host to a guest on the other host => plusminus 1Gb/s => Okay! > > 3) Between two guests on the same host => plusminus 230Mb/s ??? > > The guests have network over a bridged interface, so I tried the same test over a NAT interface => The same 230Mb/s... > > Is there a way to tweak connection speeds between two guest running on the same host? > > Thanks in advance... > > An piece of the xml dump of one of the guests: > <domain type='kvm' id='17'> > <name>PCVIRTdra</name> > <uuid>925e4f9b-2c27-406d-bdd9-f3e0b44f28bb</uuid> > <title>PCVIRTdra - PC voor dra</title> > <description></description> > <memory unit='KiB'>2097152</memory> > <currentMemory unit='KiB'>2097152</currentMemory> > <memoryBacking> > <hugepages/> > </memoryBacking> > <vcpu placement='static'>8</vcpu> > <resource> > <partition>/machine</partition> > </resource> > <os> > <type arch='x86_64' machine='pc-i440fx-utopic'>hvm</type> > <bootmenu enable='yes'/> > </os> > <features> > <acpi/> > <apic/> > <hyperv> > <relaxed state='on'/> > <vapic state='on'/> > <spinlocks state='on' retries='8191'/> > </hyperv> > </features> > <cpu mode='custom' match='exact'> > <model fallback='allow'>cpu64-rhel6</model> > <topology sockets='2' cores='2' threads='2'/> > </cpu> > <clock offset='localtime'> > <timer name='rtc' tickpolicy='catchup'/> > <timer name='pit' tickpolicy='delay'/> > <timer name='hpet' present='no'/> > <timer name='hypervclock' present='yes'/> > </clock> > <on_poweroff>destroy</on_poweroff> > <on_reboot>restart</on_reboot> > <on_crash>restart</on_crash> > <pm> > <suspend-to-mem enabled='no'/> > <suspend-to-disk enabled='no'/> > </pm> > <devices> > .... > <interface type='bridge'> > <mac address='52:54:00:b1:41:b3'/> > <source bridge='br0'/> > <target dev='vnet4'/> > <model type='virtio'/> > <alias name='net0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > </interface> > ..... > > _______________________________________________ > libvirt-users mailing list > libvirt-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/libvirt-users
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