The document discusses the importance of observability for load balancers like HAProxy. It defines observability as the ability to infer the internal state of a system from external outputs. The load balancer acts as an observation tower that sees metrics from multiple targets, allowing comparisons to detect issues. HAProxy provides logs and statistics that can be used for observability to detect
Developers.IO 2017 2017/07/01 大瀧隆太
Grafana LokiではじめるKubernetesロギングハンズオン（NTT Tech Conference #4 ハンズオン資料）
The document discusses optimizations to TCP and HTTP/2 to improve responsiveness on the web. It describes how TCP slow start works and the delays introduced in standard HTTP/2 usage from TCP/TLS handshakes. The author proposes adjusting the TCP send buffer polling threshold to allow switching between responses more quickly based on TCP congestion window state. Benchmark results show this can reduc
This document discusses optimizations for TCP/IP networking performance on multicore systems. It describes several inefficiencies in the Linux kernel TCP/IP stack related to shared resources between cores, broken data locality, and per-packet processing overhead. It then introduces mTCP, a user-level TCP/IP stack that addresses these issues through a thread model with pairwise threading, batch pac
I did a keynote presentation at the SIGCOMM'15 HotMiddlebox workshop, "Mobile TCP optimization - Lessons Learned in Production". The title was set before I had any idea of what I'd really be talking about, just that it'd be about some of the stuff we've been working on at Teclo. So apologies if the content isn't an exact match for the title. This post contains my slides, interleaved with my speake
A Look Inside Google’s Data Center NetworksAI-enhanced description 1) Google has been developing their own data center network architectures using merchant silicon switches and centralized network control since 2005 to keep up with increasing bandwidth demands. 2) Their network designs have evolved from Firehose and Watchtower to the current Saturn and Jupiter networks, increasing port speeds from
This document discusses different methods for virtualizing I/O in virtual machines. It covers virtual I/O approaches like virtio, PCI passthrough, and SR-IOV. It also explains the role of the VMM/hypervisor in managing I/O between VMs and physical devices using techniques like VT-d, Open vSwitch, and single root I/O virtualization. Finally, it discusses emerging standards for virtual switching lik
先日、株式会社ハートビーツさんが主催されている勉強会、hbstudy#27にて弊社クラウドサービスのネットワーク構成について発表を行いましたので、そのご報告です。 今年11月中旬に石狩データセンターの開所にあわせてクラウドサービス（さくらのクラウド）をリリース予定です。 そのネットワークの構築を私の方で担当しており、こちらの勉強会では、ネットワーク全体のアーキテクチャ、ネットワーク機器評価試験の際にはまりやすい（はまった）ポイント、今後の展開について説明をさせていただきました。
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