原创 TCP BIC 擁塞控制源碼分析
1、對於TCP協議數據傳輸優化來說最大的難點就在於物理帶寬的估計，網絡的複雜性決定了擁塞控制算法作用的有限性和Linux內核支持的擁塞控制算法（reno、newreno、hybla、bic、cubic、westwood、vega
2020-02-26 01:39:21
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原创 linux tcp SACK分析（一）
why should SACK be designed ? TCP may experience poor performance when multiple packets are lost from one window
2020-02-26 01:39:21
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原创 C 語言 宏的妙用
Editor's note: Andrew Lucas describes how to use X macros to take advantage of the C-language pre-processor to elimin
2020-02-26 01:39:21
原创 字符設備主次設備號的作用
One of the basic features of the Linux kernel is that it abstracts the handling of devices. All hardware devices
2020-02-26 01:39:20
原创 SYSCALL_DEFINE5 setsockopt 代碼流程
SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, char __user *, optval, int, optlen) { int er
2018-12-16 14:24:55
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原创 Kernel Debugging Tricks
Kernel Debugging Tricks Debugging the kernel is not necessarily rocket science; in fact it can be achieved using ver
2018-09-02 02:47:43
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原创 Debugging Analysis of Kernel panics and Kernel oopses using System Map
原文地址：https://sanjeevsharmaengg.wordpress.com/2014/06/23/debugging-analysis-of-kernel-panics-and-kernel-oopses-using-sy
2018-09-02 02:47:43
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原创 tso硬件分片是頭部拷貝問題
//skb->date指向了二層頭部地址，下面是計算 以太網頭 + IP頭 大小static inline int skb_transport_offset(const struct sk_buff *skb){ return skb_t
2018-09-02 02:47:43
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原创 tcp jprobe 利用問題定位
/* * Here's a sample kernel module showing the use of jprobes to dump * the arguments of do_fork(). * * For more in
2018-09-02 02:47:43
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原创 什麼時候去發送 update windos報文
/* Clean up the receive buffer for full frames taken by the user, * then send an ACK if necessary. COP
2018-09-02 02:47:43
原创 RFC 793 爲什麼要發送reset，什麼情況下發送reset
A variety of other cases are possible, all of which are accounted for by the following rules for RST generation and
2018-09-02 02:47:43
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原创 Linux Kernel: Deadlocks and how to avoid them
Linux Kernel: Deadlocks and how to avoid themDeadlock Problem:Scenario 1: Self deadlock - "re-acquire lock"Say there's
2018-09-02 02:47:43
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原创 Tcpdump抓包內核代碼分析
註冊pf_packet協議 .create函數是在PF_PACKET類型socket創建時調用，調用時註冊了鉤子函數具體看packet_create函數的實現。static const struct net_proto_familyp
2018-09-02 02:47:41
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原创 TCP 指定源端口
轉載，原文地址：http://blog.csdn.net/liangxiaozhang/article/details/8267854 #include <stdio.h> #include <stdlib.h> #include <
2018-09-02 02:47:41
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原创 centos 7 取消LOG輸出限制
Add the following to /etc/rsyslog.conf after '$ModLoad imuxsock' and '$ModLoad imjournal': $IMUXSockRateLimitInterval
2018-09-02 02:47:41