[libvirt-users] Strange QoS behavior
Hi, I'm having some weird problem with the setup of the QoS on a bridged network. As the docs states, outbound/inbound average speed should be expressed in KBps (KBytes per second) but in order to get a maximum speed of 10Mbps (megabits per second) surprising enough I have to use 2560 on the guest (not 1280 as expected). Using 1280 units I get a speed og 5Mbps. I'm aware of peak and burst parameters but even with them I'm seeing the same (long-term) behavior. Here follows my configuration. Thank you in advance for any help you can provide. Domain definition (relevant part only) virsh # dumpxml mydomain <domain type='kvm' id='45'> [...] <devices> [...] <interface type='network'> <mac address='52:54:00:xx:xx:xx'/> <source network='br909'/> <target dev='vnet43'/> <model type='virtio'/> <bandwidth> <inbound average='2560'/> <outbound average='2560'/> </bandwidth> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> [...] </devices> </domain> The network definition: virsh # net-dumpxml br909 <network> <name>br909</name> <uuid>07319380-2025-cdcc-924a-149cd0370b56</uuid> <forward mode='bridge'/> <bridge name='br909' /> </network> And iperf result (client and server are on the same vlan and they are running on the same host) [ 5] local xx.xx.xx.xx port 5001 connected with xx.xx.xx.yy port 18396 [ 5] 0.0-30.1 sec 35.4 MBytes 9.87 Mbits/sec
On 03.12.2012 16:37, Davide Guerri wrote:
Hi, I'm having some weird problem with the setup of the QoS on a bridged network.
As the docs states, outbound/inbound average speed should be expressed in KBps (KBytes per second) but in order to get a maximum speed of 10Mbps (megabits per second) surprising enough I have to use 2560 on the guest (not 1280 as expected). Using 1280 units I get a speed og 5Mbps.
I'm aware of peak and burst parameters but even with them I'm seeing the same (long-term) behavior.
Here follows my configuration.
Thank you in advance for any help you can provide.
Domain definition (relevant part only)
virsh # dumpxml mydomain <domain type='kvm' id='45'> [...] <devices> [...] <interface type='network'> <mac address='52:54:00:xx:xx:xx'/> <source network='br909'/> <target dev='vnet43'/> <model type='virtio'/> <bandwidth> <inbound average='2560'/> <outbound average='2560'/> </bandwidth> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> [...] </devices> </domain>
The network definition: virsh # net-dumpxml br909 <network> <name>br909</name> <uuid>07319380-2025-cdcc-924a-149cd0370b56</uuid> <forward mode='bridge'/> <bridge name='br909' /> </network>
And iperf result (client and server are on the same vlan and they are running on the same host)
[ 5] local xx.xx.xx.xx port 5001 connected with xx.xx.xx.yy port 18396 [ 5] 0.0-30.1 sec 35.4 MBytes 9.87 Mbits/sec
Hm, strange. What does: tc class show dev vnet43 tc filter show dev vnet43 tc qdisc show dev vnet43 show?
Here they are: !(~) # tc class show dev vnet43 class htb 1:1 root prio 0 rate 20480Kbit ceil 20480Kbit burst 1597b cburst 1597b !(~) # tc filter show dev vnet43 filter parent 1: protocol ip pref 49152 fw filter parent 1: protocol ip pref 49152 fw handle 0x1 classid :1 !(~) # tc qdisc show dev vnet43 qdisc htb 1: root refcnt 2 r2q 10 default 1 direct_packets_stat 0 qdisc ingress ffff: parent ffff:fff1 ---------------- On 03/dic/2012, at 17:19, Michal Privoznik <mprivozn@redhat.com> wrote:
On 03.12.2012 16:37, Davide Guerri wrote:
Hi, I'm having some weird problem with the setup of the QoS on a bridged network.
As the docs states, outbound/inbound average speed should be expressed in KBps (KBytes per second) but in order to get a maximum speed of 10Mbps (megabits per second) surprising enough I have to use 2560 on the guest (not 1280 as expected). Using 1280 units I get a speed og 5Mbps.
I'm aware of peak and burst parameters but even with them I'm seeing the same (long-term) behavior.
Here follows my configuration.
Thank you in advance for any help you can provide.
Domain definition (relevant part only)
virsh # dumpxml mydomain <domain type='kvm' id='45'> [...] <devices> [...] <interface type='network'> <mac address='52:54:00:xx:xx:xx'/> <source network='br909'/> <target dev='vnet43'/> <model type='virtio'/> <bandwidth> <inbound average='2560'/> <outbound average='2560'/> </bandwidth> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> [...] </devices> </domain>
The network definition: virsh # net-dumpxml br909 <network> <name>br909</name> <uuid>07319380-2025-cdcc-924a-149cd0370b56</uuid> <forward mode='bridge'/> <bridge name='br909' /> </network>
And iperf result (client and server are on the same vlan and they are running on the same host)
[ 5] local xx.xx.xx.xx port 5001 connected with xx.xx.xx.yy port 18396 [ 5] 0.0-30.1 sec 35.4 MBytes 9.87 Mbits/sec
Hm, strange. What does:
tc class show dev vnet43 tc filter show dev vnet43 tc qdisc show dev vnet43
show?
2012/12/4 Davide Guerri <davide.guerri@gmail.com>
Here they are:
!(~) # tc class show dev vnet43 class htb 1:1 root prio 0 rate 20480Kbit ceil 20480Kbit burst 1597b cburst 1597b
!(~) # tc filter show dev vnet43 filter parent 1: protocol ip pref 49152 fw filter parent 1: protocol ip pref 49152 fw handle 0x1 classid :1
!(~) # tc qdisc show dev vnet43 qdisc htb 1: root refcnt 2 r2q 10 default 1 direct_packets_stat 0 qdisc ingress ffff: parent ffff:fff1 ----------------
On 03/dic/2012, at 17:19, Michal Privoznik <mprivozn@redhat.com> wrote:
Hi, I'm having some weird problem with the setup of the QoS on a bridged network.
As the docs states, outbound/inbound average speed should be expressed in KBps (KBytes per second) but in order to get a maximum speed of 10Mbps (megabits per second) surprising enough I have to use 2560 on the guest (not 1280 as expected). Using 1280 units I get a speed og 5Mbps.
I'm aware of peak and burst parameters but even with them I'm seeing
On 03.12.2012 16:37, Davide Guerri wrote: the same (long-term) behavior.
Here follows my configuration.
Thank you in advance for any help you can provide.
Domain definition (relevant part only)
virsh # dumpxml mydomain <domain type='kvm' id='45'> [...] <devices> [...] <interface type='network'> <mac address='52:54:00:xx:xx:xx'/> <source network='br909'/> <target dev='vnet43'/> <model type='virtio'/> <bandwidth> <inbound average='2560'/> <outbound average='2560'/> </bandwidth> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface> [...] </devices> </domain>
The network definition: virsh # net-dumpxml br909 <network> <name>br909</name> <uuid>07319380-2025-cdcc-924a-149cd0370b56</uuid> <forward mode='bridge'/> <bridge name='br909' /> </network>
And iperf result (client and server are on the same vlan and they are running on the same host)
[ 5] local xx.xx.xx.xx port 5001 connected with xx.xx.xx.yy port 18396 [ 5] 0.0-30.1 sec 35.4 MBytes 9.87 Mbits/sec
Hm, strange. What does:
tc class show dev vnet43 tc filter show dev vnet43 tc qdisc show dev vnet43
show?
you can use this command to list the filter: tc filter list dev vnet43 root and check the mtu , and also read this: http://www.redhat.com/archives/libvir-list/2011-August/msg00333.html as i know,the libvirt0.9.10 has this problem,while the mtu has been set to 64k in libvirt dev version
On 04.12.2012 04:24, Gao Yongwei wrote:
2012/12/4 Davide Guerri <davide.guerri@gmail.com <mailto:davide.guerri@gmail.com>>
Here they are:
!(~) # tc class show dev vnet43 class htb 1:1 root prio 0 rate 20480Kbit ceil 20480Kbit burst 1597b cburst 1597b
!(~) # tc filter show dev vnet43 filter parent 1: protocol ip pref 49152 fw filter parent 1: protocol ip pref 49152 fw handle 0x1 classid :1
!(~) # tc qdisc show dev vnet43 qdisc htb 1: root refcnt 2 r2q 10 default 1 direct_packets_stat 0 qdisc ingress ffff: parent ffff:fff1 ----------------
On 03/dic/2012, at 17:19, Michal Privoznik <mprivozn@redhat.com <mailto:mprivozn@redhat.com>> wrote:
> On 03.12.2012 16:37, Davide Guerri wrote: >> Hi, >> I'm having some weird problem with the setup of the QoS on a bridged network. >> >> As the docs states, outbound/inbound average speed should be expressed in KBps (KBytes per second) but in order to get a maximum speed of 10Mbps (megabits per second) surprising enough I have to use 2560 on the guest (not 1280 as expected). >> Using 1280 units I get a speed og 5Mbps. >> >> I'm aware of peak and burst parameters but even with them I'm seeing the same (long-term) behavior. >> >> Here follows my configuration. >> >> Thank you in advance for any help you can provide. >> >> >> >> Domain definition (relevant part only) >> >> virsh # dumpxml mydomain >> <domain type='kvm' id='45'> >> [...] >> <devices> >> [...] >> <interface type='network'> >> <mac address='52:54:00:xx:xx:xx'/> >> <source network='br909'/> >> <target dev='vnet43'/> >> <model type='virtio'/> >> <bandwidth> >> <inbound average='2560'/> >> <outbound average='2560'/> >> </bandwidth> >> <alias name='net0'/> >> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> >> </interface> >> [...] >> </devices> >> </domain> >> >> >> The network definition: >> virsh # net-dumpxml br909 >> <network> >> <name>br909</name> >> <uuid>07319380-2025-cdcc-924a-149cd0370b56</uuid> >> <forward mode='bridge'/> >> <bridge name='br909' /> >> </network> >> >> >> And iperf result (client and server are on the same vlan and they are running on the same host) >> >> [ 5] local xx.xx.xx.xx port 5001 connected with xx.xx.xx.yy port 18396 >> [ 5] 0.0-30.1 sec 35.4 MBytes 9.87 Mbits/sec > > Hm, strange. What does: > > tc class show dev vnet43 > tc filter show dev vnet43 > tc qdisc show dev vnet43 > > show?
you can use this command to list the filter: tc filter list dev vnet43 root and check the mtu , and also read this:http://www.redhat.com/archives/libvir-list/2011-August/msg00333.html as i know,the libvirt0.9.10 has this problem,while the mtu has been set to 64k in libvirt dev version
The fix corresponds to commit 0ac3baee2c2fd56ef89f24f5ea484e39d2bf35f5 (1) which is part of the 0.9.13 release. Michal 1: http://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=0ac3baee2c2fd56ef89f24f...
participants (3)
-
Davide Guerri -
Gao Yongwei -
Michal Privoznik