kernelチューニング
linuxサーバのOS全体に効くカーネルパラメータのチューニング箇所と その設定値、またその理由をまとめておく。 あくまで自分の環境ではこうした、というだけであり、 提供するサービスごとに検討が必要である。 どこをどう変更するのか、または変えないのか、その判断材料にはなるだろう。 ※ユーザ単位でシステムリソースに制限をかける場合をこちらを参照してほしい。 以下は/etc/sysctl.conf で設定するものとする。 ● 大規模サイト用チューニング kernel.pid_max 動作：pidの最大数 設定値：131072 理由：pidを枯渇させない vm.max_map_count 動作：mmapやmalloc時にメモリを仮想空間にマッピングできる最大ページ数 設定値：300000 理由：マッピングできなくなる事態を防ぐ net.core.somaxconn 動作：接続(ソケット)キューの
Improving Measured Latency in Linux for Intel® 82575/82576 or X540/82598/82599 Ethernet Controllers
Revision 1.2 Improving Measured Latency in Linux for Intel® 82575/82576 or X540/82598/82599 Ethernet Controllers June 2012 2 Legal Lines and Disclaimers INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIO
Assigning Interrupts to Processor Cores using an Intel(r) 82575/82576 or 82598/82599 Ethernet Controller
319935-002 Assigning Interrupts to Processor Cores using an Intel® 82575/82576 or 82598/82599 Ethernet Controller September 2009 ndefi undefined undefined undefined undefine undefined undefined undefined undefined undefined undefined undefined d undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined un ed undefined undefined undefined undefined undefine
Conntrack tuning – KHnetWiki
Netfilter conntrack performance tweaking, v0.8 Hervé Eychenne <rv _AT_ wallfire _DOT_ org> This document explains some of the things you need to know for netfilter conntrack (and thus NAT) performance tuning. Latest version of this document can be found at: www.wallfire.org preambule There are two parameters we can play with: - the maximum number of allowed conntrack entries, which will be called
Engine Yard Blog
We are proud to be working with our customers while they continue to enjoy our Engine Yard products. Here are some changes we are making
Red Hat Enterprise Linux - Red Hat Customer Portal
Performance Tuning Guide 1. Overview Expand section "1. Overview" Collapse section "1. Overview" 1.1. How to read this book Expand section "1.1. How to read this book" Collapse section "1.1. How to read this book" 1.1.1. Audience 1.2. Release overview Expand section "1.2. Release overview" Collapse section "1.2. Release overview" 1.2.1. New features in Red Hat Enterprise Linux 6 1.2.2. Horizontal
Linux Tuning
This page contains a quick reference guide for Linux tuning for Data Transfer hosts connected at speeds of 1Gbps or higher. Note that most of the tuning settings described here will actually decrease performance of hosts connected at rates less than 1Gbps, such as most home users. Note that the settings on this page are not attempting to achieve full 10G with a single flow. These settings assume y
SACSIS.TCP - HPCユーザが知っておきたいTCP/IPの話
HPC TCP/IP 2009 5 29 SACSIS2009 HPC TCP/IP 2 • • 1 Gbps RTT 100 • 240 Mbps ☹ • 940 Mbps ☺ (2) HPC TCP/IP • Ethernet PC • TCP/IP 2 10MB 3 0 200 400 600 800 1000 0 100 200 300 400 500 600 Bandwidth (Mbps) Time (msec) 160 0 200 400 600 800 1000 0 100 200 300 400 500 600 Bandwidth (Mbps) Time (msec) x3.5 (2) • TCP/IP • • MPI • TCP/IP TCP • TCP Reno [RFC2851] • TCP CUBIC Compound TCP 4 (3) • TCP/IP • T
IBM Redbooks | Linux Performance and Tuning Guidelines
Over the past few years, Linux has made its way into the data centers of many corporations all over the globe. The Linux operating system has become accepted by both the scientific and enterprise user population. Today, Linux is by far the most versatile operating system. You can find Linux on embedded devices such as firewalls and cell phones and mainframes. Naturally, performance of the Linux op
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