Category Archives: Info.Tech
How to build an ARM HPC cluster
Background
Nowadays ARM-based servers are being applied to many scenarios, so we are going to port some workload to the minimal ARM SoC with NVIDIA GPU to evaluate the feasibility of production usage.
P
… Read more...PetaLinux in QEMU HowTo
Background
Before stepping into the virtio acceleration, we will build and run a Linux(PetaLinux) in FPGA.
Despite the poor performance of simulation in X86, it’s very convenient to create POC.
We … Read more...
P4 Network with Xilinx FPGA
0. Background
As we all know, P4 is about to be the future of OpenFlow 2.0, and to achieve an totally software defined network with programmable control plane and data plane.
1. Basic Knowledge
Since we&… Read more...
Design of Fault Tolerance x86 Server with FPGA
1. Background
Since the MicroBlaze provides the lockstep feature, so finally we can make a POC.
2. MicroBlaze FT Test
3. Server FT Test via MicroBlaze FT controller
[1] Triple Modular Redundancy: ht… Read more...
Software Defined Radio Device/Software/Application Guide
注意：本文内容仅限于实验室安全测试目的，禁止用于任何商业或违反当地法律法规的活动。
不管是较贵的Ettus还是入门的HackRF，抑或是最初级的RTL-SDR设备，都可以使用这篇教程中的绝大部分内容。
https://github.com/mossmann/hackrf/wiki
https://www.hackrf.net/hackrf%E4%B8%8Egnuradio%E5%85%A5%E9%97%… Read more...
Boost Virtualization Performance with Xilinx/Intel FPGA
UPDATE: 老王的笔记中也总结了一些关于devconf的内容。
This article is just a collection of ideas and posts.
Recently I was doing some performance-tunning of QEMU/KVM with kinds of pure-software ways. However, it ended with… Read more...
Porting KVM to NVIDIA Jetson Nano
因为Jetson如果作为边缘设备，那么我们需要进一步探索虚拟化在其上的可能性，从而使FT有更容易的路线可走，还有既然它的芯片是PCIE的，那理应可以透传。
参考：https://elinux.org/Jetson/Nano/Upstream
什么build rootfs、uboot之类的就不要了，那是后期嵌入式的活，我们在现有环境上build kernel即可。
1. 准备环境
访问链接https://d… Read more...
NVIDIA Jetson End-User Guide
本文将以NVIDIA Jetson为硬件基础，为你展现NVIDIA的力量，可以将其作为Jetson Nano的入门参考手册（教程）。
1. 入门篇
入门篇的有两章内容，来自NVIDIA JETSON包装盒自带的内容。
1.1. 准备环境
Ref.1: https://developer.nvidia.com/embedded/learn/get-started-jetson-nano-devkit
Ref.… Read more...
Build NetLogo for ARM(NVIDIA-JETSON-NANO)
本文主要目的为测试这块板子的性能，看看其是否有作为边缘节点的能力。
Env
Ubuntu 18.04(jetson-nano-sd-r32.1-2019-03-18)
Prepare
Build a robot assistant with nowadays cloud apis
好多年前就想做个Jarvis，当时技术所限，构建出一个比较初级的机器人后觉得它还不如一条狗。
现在随着AI以及计算技术的成熟，尤其Google Assistant已经可以跟人自然语音对话了，所以觉得可以再尝试一下，加之工作需要，所以便又再开启。
现在随着AI以及计算技术的成熟，尤其Google Assistant已经可以跟人自然语音对话了，所以觉得可以再尝试一下，加之工作需要，所以便又再开启。
当… Read more...
docker using linux bridge
A. Change docker bridge
dockerd -H unix:// -b br_eth0 –fixed-cidr=172.20.230.1/24 –default-gateway 172.20.0.1
B. Create manually, but flexibly
Recreate veth pair if your docker instance was r… Read more...
transfer IPv6 to IPv4 via socat
Suppose that you have an ipv6-only server A with ip [ipv6-A], and ipv4-ipv6 server B with ip (ipv4-B, [ipv6-B]).
If you wanna visit http://[ipv6-A]:80, but your ISV does not provide some ipv6 addresses… Read more...
Forex Data ML Relationship
Data Processing with ML
Data Overview:
1. Forex Index < -> Currency Rate Change
2. News -Classification -Weight < -> Currency Rate Change
Caution:
Strict Time Based Data pipeline.… Read more...
HPC Guideline for newbie
This is a HPC guide for newbies. You DO NOT have to see into it but at a glance.
1. History
Wikipedia is good.
https://en.wikipedia.org/wiki/Supercomputer
2. Stack
2.1. Hardware
Storage
Network
Server
Cooler
2.
… Read more...备份工具（迁云必备）
UrBackup https://www.urbackup.org/features.html
Amanda http://amanda.zmanda.com/
Bacula https://blog.bacula.org/
BareOS https://www.bareos.org
Duplicati https://www.duplicati.com
kvmBackup https://github.c… Read more...
NVIDIA GRID vGPU and KVMGT for KVM
This article will tell you how to use NVIDIA vGPU and KVMGT in KVM hypervisor with mdev.
I’ll use NVIDIA M60 and RHEL 7.4 for testing.
1. NVIDIA vGPU
1.1. Prepare drivers and utilities
1.2. Create v
… Read more...Home-based hybridcloud（家庭作坊式混合云）
名字起的不好听，不过无所谓，也是混合云了，做到了什么地步呢？
在数据层面，家中机器和linode以及gcp公有云全通，任意地点的客户端可以通过局域网地址访问家中和公有云，而这一且，只需要一个公网IP。那么如何组建呢？
1. 选择一个趁手的VPN，这里我使用的是SoftEther，全平台全功能，图形界面客户端全都有，自带域名反向解析，自带公网，又那么稳定，为啥不用。
只要在家中的… Read more...
ZStack OpenStack API wrapper
This is a flag.… Read more...
OAuth2 Guide
这是一篇OAuth2的入门短文，这就开始。
整体可以参考Hydra OAuth2的搭建过程，非常详细，过程就不讲了，直接看图更直观。
建议过程：在host上搭建server以后，创建client、user、callback_url，还能绑定OpenID，多好。… Read more...