TCP Series — TCP Receive Buffer and Receive Window

Linux Clone system call

When reading the strace output of a multithreaded process that also forks child processes, it sometimes becomes necessary to distinguish between thread creation and process creation.

Apache HTTP Server — Multi-process architecture

Introduction

APR memory pool

The Apache HTTPD Web Server uses APR pools for memory allocation. In this article, I would like to talk about how APR pools work.

TCP Series — TCP debugging using ss

In this post, I’d like to describe some very basic use cases of using the ss command that are…

TCP Series — TCP slow start

At the start of a connection, TCP uses a method called Slow Start to find out the maximum possible speed it…

Improving Apache HTTP Server’s performance using ListenCoresBucketsRatio directive

TCP Series — Monitoring Listen Overflows

In this post, I’d like to describe an issue that may go un-noticed when running Web…

Network sockets basics

A listening socket is created when the following system calls are executed -

• socket(int domain, int type, int protocol);
• int bind(int sockfd, const struct sockaddr *addr,
   socklen_t addrlen);
• int listen(int…

Sending hand-crafted HTTP requests

While debugging HTTP issues, it sometimes becomes necessary to create HTTP requests…