Hello,
hope someone can help with this strange problem.
I've really huge network/disc performance issues within my ubuntu 18.04 kvm guest which is running on my ubuntu 16.04 kvm host.
The problem is network really only visible in apt which has download-rates of ~70 KB/s!
When I download a large file like Ubuntu Server within the guest the download-speed is 8-10 MByte/s!
The hypervisor (ubuntu server 16.04):
xml disc config of VM:
iperf3 test between kvm hypervisor and guest:
iperf3 test between other host on network and VM:
Thanks in advance :)
hope someone can help with this strange problem.
I've really huge network/disc performance issues within my ubuntu 18.04 kvm guest which is running on my ubuntu 16.04 kvm host.
The problem is network really only visible in apt which has download-rates of ~70 KB/s!
When I download a large file like Ubuntu Server within the guest the download-speed is 8-10 MByte/s!
The hypervisor (ubuntu server 16.04):
- Intel i7-4770K CPU
- 32 GByte RAM
xml disc config of VM:
Code:
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writethrough' io='threads'/>
<source file='/var/lib/libvirt/images/client.raw'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>Code:
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 3.91 GBytes 33.6 Gbits/sec 0 3.02 MBytes
[ 4] 1.00-2.00 sec 3.24 GBytes 27.9 Gbits/sec 0 3.02 MBytes
[ 4] 2.00-3.00 sec 3.41 GBytes 29.3 Gbits/sec 0 3.02 MBytes
[ 4] 3.00-4.00 sec 3.73 GBytes 32.0 Gbits/sec 0 3.02 MBytes
[ 4] 4.00-5.00 sec 4.38 GBytes 37.6 Gbits/sec 0 3.02 MBytes
[ 4] 5.00-6.00 sec 3.88 GBytes 33.3 Gbits/sec 0 3.02 MBytes
[ 4] 6.00-7.00 sec 3.86 GBytes 33.2 Gbits/sec 0 3.02 MBytes
[ 4] 7.00-8.00 sec 3.59 GBytes 30.8 Gbits/sec 0 3.02 MBytes
[ 4] 8.00-9.00 sec 3.48 GBytes 29.9 Gbits/sec 0 3.02 MBytes
[ 4] 9.00-10.00 sec 3.43 GBytes 29.5 Gbits/sec 0 3.02 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 36.9 GBytes 31.7 Gbits/sec 0 sender
[ 4] 0.00-10.00 sec 36.9 GBytes 31.7 Gbits/sec receiver
Code:
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 112 MBytes 941 Mbits/sec 0 2.95 MBytes
[ 4] 1.00-2.00 sec 110 MBytes 924 Mbits/sec 0 2.95 MBytes
[ 4] 2.00-3.00 sec 107 MBytes 896 Mbits/sec 0 2.95 MBytes
[ 4] 3.00-4.00 sec 110 MBytes 920 Mbits/sec 0 3.10 MBytes
[ 4] 4.00-5.00 sec 109 MBytes 914 Mbits/sec 0 3.10 MBytes
[ 4] 5.00-6.00 sec 108 MBytes 910 Mbits/sec 0 3.10 MBytes
[ 4] 6.00-7.00 sec 111 MBytes 934 Mbits/sec 0 3.10 MBytes
[ 4] 7.00-8.00 sec 110 MBytes 923 Mbits/sec 0 3.10 MBytes
[ 4] 8.00-9.00 sec 109 MBytes 914 Mbits/sec 0 3.10 MBytes
[ 4] 9.00-10.00 sec 110 MBytes 927 Mbits/sec 0 3.10 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.07 GBytes 920 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 1.07 GBytes 920 Mbits/sec receiver