How to optimize bandwidth on Ethernet networks
The blog 45 Drives published quite interesting material by Rob McQueen, who works in the R & D department of the company. It deals with bandwidth optimization. Let's try to figure out this story and the main points that Rob talked about.
/ Photo by Karl Baron CC
Rob compares the 10-gigabit standard with the purchase of a new Mustang after years of riding a regular city sedan - gigabit Ethernet. Similarity in configuration allows not only to easily switch from one to another, but also to configure 20-gigabit and 30-gigabit connections.
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Automotive analogies are quite appropriate, because the throughput as a concept is similar to what a highway is: the more lanes on the road, the more cars use the road. With IT infrastructure, everything is the same.
What equipment is mentioned here:
The fact is that any OS, automatically determine the possibility of using a 10-gigabit network card - so the whole process is identical to the configuration of a standard gigabit network.
What else:
The whole further process is based on combining several 10-gigabit connections. The driver for linking channels is already in Linux - additional software is not required here.
Next in CentOS you need to create a configuration file (devices, IP, subnet, linking mode, and so on). To solve this problem, Rob advises you to take a look at his channel modification guide for CentOS 7. The setup process for FreeNAS is here .
Rob faced an unforeseen problem, which allowed us to get bandwidth of only 11.3 Gbit / s (instead of 20 Gbit / s). Suspicion fell on the standard TCP window size, but in the end it turned out that Linux itself determines the optimal window size.
Another move - switching to Jumbo frames gave only 13.9 Gbit / s. But two network cards in each machine and linking two interfaces (one for each card) with the switch gave the desired 20-gigabit connection (as confirmed by iperf).
PS Other materials on the topic from our blog:
/ Photo by Karl Baron CCRob compares the 10-gigabit standard with the purchase of a new Mustang after years of riding a regular city sedan - gigabit Ethernet. Similarity in configuration allows not only to easily switch from one to another, but also to configure 20-gigabit and 30-gigabit connections.
')
Automotive analogies are quite appropriate, because the throughput as a concept is similar to what a highway is: the more lanes on the road, the more cars use the road. With IT infrastructure, everything is the same.
What equipment is mentioned here:
- Storinator storage cells (read and write speeds greater than 2 GB / s)
- Netgear XS708E Switch
- Intel X540-T2 network adapters (go to the Storinator)
- Cat 6, Cat 6a and Cat7 network cables
The fact is that any OS, automatically determine the possibility of using a 10-gigabit network card - so the whole process is identical to the configuration of a standard gigabit network.
What else:
- DHCP for the switch - issuing IP addresses
- iperf to test the quality of the network connection
The whole further process is based on combining several 10-gigabit connections. The driver for linking channels is already in Linux - additional software is not required here.
Next in CentOS you need to create a configuration file (devices, IP, subnet, linking mode, and so on). To solve this problem, Rob advises you to take a look at his channel modification guide for CentOS 7. The setup process for FreeNAS is here .
Rob faced an unforeseen problem, which allowed us to get bandwidth of only 11.3 Gbit / s (instead of 20 Gbit / s). Suspicion fell on the standard TCP window size, but in the end it turned out that Linux itself determines the optimal window size.
Another move - switching to Jumbo frames gave only 13.9 Gbit / s. But two network cards in each machine and linking two interfaces (one for each card) with the switch gave the desired 20-gigabit connection (as confirmed by iperf).
PS Other materials on the topic from our blog:
- IaaS or VMware Virtual Infrastructure in Practice
- VMware vSphere Client 3.0 - an overview of key features
- Performance Optimization in vSphere: Solving Major CPU Problems
- VMware NSX: A New Approach to Health Security
- VMware Cloud Foundation: Simplified Software Data Center and Hybrid Cloud Deployment
- Solving the problem of network connection loss in VMware virtual machines in the IaaS cloud
- VMware Virtual SAN (vSAN) Solution Features
Source: https://habr.com/ru/post/267629/
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