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>
.....
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