Date post: | 03-Jul-2015 |
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Technology |
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All bow to OpenSolaris CrossBow
Abd4llAEGOSUG
• Crossbow (The Name)• The Past• The Future is Present• Past is Full of Problems• CrossBow Architecture• Demo
Overview
• Crossbow was invented in 314 B.C in China
• They prevailed in middle ages when steel was used in them
• Crossbows are easier to learn and more effective than normal bows
• QoS mechanisms are the same as normal bows, requires long time to master.
CrossBow (The Name)
• Without QoS, life can turn into hell
• QoS mechanisms are
– Complex
– Come with a performance penalty
• The interrupt based delivery mechanism for inbound packets and the QoS are implemented by a separate layer
• Packets are already delivered to the host memory by means of interrupts before QoS takes place
•
The Past
• Crossbow
– Network Virtualization
– Resource Control
– Live Monitoring
• Networking Virtualization is essential in today's Virtual World
The Future is Present
Crossbow completes Network Virtualization
The Future is Present
• You can split physical NICs into multiple VNICs
• A VNIC: a virtual network device with the same data-link interface as a physical interface.
• VNICs can have their own resources “DMA channel, MAC, kernel threads and queues”
• Each VNIC is implicitly connected to a virtual switch that corresponds to the physical interface.
• Virtual Machines on the same host can communicate through Virtual Switches
• Interrupt driven packet delivery model precludes any kind of policy enforcement and fair sharing.
• Most of the time, the processing of a critical packet is interrupted to deal with the arrival of a non critical packet.
• The cost of dropping unwanted packets is too high
• Common queues and common threads make enforcing policies based on traffic type very difficult.
• Pseudo NICs has no way of knowing about the hardware capabilities of the real hardware
Past is Full of Problems
• Integrates network virtualization and resource control as part of the stack architecture.
• Pushes the classification of packets based on services, protocols or virtual machines as far below as possible.
– Rx/Tx Rings -> CPU -> Squeue
• Rx/Tx ring, its DMA channel, MSI-X interrupt, the Squeue, the CPU, and processing threads are unique for the service, protocol or virtual machine
• It can be assigned a VNIC in case of Virtual Machines
Crossbow's Architecture
• If classification has already been done by the NIC to a particular Rx ring the entire data link layer is bypassed unless in promiscuous
• In case, the NIC hardware does not have classification capability, soft rings are used in Data-link layer “Pseudo Hardware Layer”
• The entire layered architecture is built on function pointers known us 'upcall_func' and 'downcall_func'
• ss
Crossbow's Architecture
Our demo has a vmachine on which we wanna create a vnic for it, and put alimit on the total nic ssh traffic
Demo
• Create the vnic:root@A0059:~# dladm create-vnic -l e1000g0 f11-vnic1
• Assign the vnic to your vmachine
• Add the flow:root@A0059:~# flowadm add-flow -l e1000g0 -a
transport=TCP,local_port=22 ssh-policy
• Set maximum bandwidth:root@A0059:~# flowadm set-flowprop -p maxbw=50M ssh-policy
Demo
Thank you
Join Us
EGOSUGhttp://www.opensolaris.org/os/project/egosug/
Ahmed AbdallaAhmed Abdalla
http://www.Abd4llA.comhttp://www.Abd4llA.com
[email protected]@AhmedAbdalla.net