05 2014 档案

[fw]Linux系统使用time计算命令执行的时间
摘要：Linux系统使用time计算命令执行的时间当测试一个程序或比较不同算法时，执行时间是非常重要的，一个好的算法应该是用时最短的。所有类UNIX系统都包含time命令，使用这个命令可以统计时间消耗。例如：[root@localhost ~]# time lsanaconda-ks.cfg insta... 阅读全文
posted @ 2014-05-30 15:48 jeremyatchina 阅读(5447) 评论(0) 推荐(0)
Ubuntu login as root automatically
摘要：vim /etc/lightdm/lightdm.confFinally, edit the file as shown below and save it.autologin-user=autologin-user-timeout=0 阅读全文
posted @ 2014-05-26 15:10 jeremyatchina 阅读(267) 评论(0) 推荐(0)
Add a system call on Ubuntu 13.04(x64) with x86_64
摘要：We added a system call to modify idt table, then programed it inmodify_idt.c1. Put our modify_idt.c file in/usr/src/linux-3.10.15/arch/x86/kernel2./us... 阅读全文
posted @ 2014-05-21 22:43 jeremyatchina 阅读(509) 评论(2) 推荐(0)
[心得]編寫Linux kernel modules時惱人的Makefile
摘要：在一台機器上寫好這樣的Makefile用以編譯modulesobj-m:=hello.oCURRENT_PATH:=$(shell pwd)VERSION_NUM:=$(shell uname -r)LINUX_PATH:=/usr/src/linux-$(VERSION_NUM)all : ma... 阅读全文
posted @ 2014-05-21 11:07 jeremyatchina 阅读(427) 评论(0) 推荐(0)
[心得]Ubuntu無法ssh登入
摘要：裝好ssh後，發覺無法用root登入，可是sshd_config接正確。後來發現原因在於，Ubuntu沒有root帳號，但是可以透過sudo -s拿到root權限。su root 密碼怎樣打也行不通，不過sudo -s卻可以。總之就是要用sudo -s 後 執行passwd 建立帳號ref.http... 阅读全文
posted @ 2014-05-20 23:04 jeremyatchina 阅读(239) 评论(0) 推荐(0)
How To Release and/or Renew IP Addresses on Windows XP | 2000 | NT
摘要：Type 'ipconfig' (without the quotes) to view the status of the computer's IP address(es).If the computer is holding a current IP address, type 'ipconf... 阅读全文
posted @ 2014-05-19 13:59 jeremyatchina 阅读(190) 评论(0) 推荐(0)
ftrace 使用方法
摘要：1. 追蹤Kernel function (以schedule()示範)先至/sys/kernel/debug/tracing# cat available_tracers確定有無 函式追蹤器(function)blk mmiotrace function_graph wakeup_rt wakeu... 阅读全文
posted @ 2014-05-15 13:59 jeremyatchina 阅读(536) 评论(0) 推荐(0)
在Ubuntu custom kernel上裝perf by compile
摘要：Using perf, the Linux Performance Analysis tool on Ubuntu KarmicA lot has been going on with Linux performance counters (now called performance events... 阅读全文
posted @ 2014-05-15 10:49 jeremyatchina 阅读(600) 评论(4) 推荐(0)
[fw]How to use DISM to install a hotfix from within Windows
摘要：How to use DISM to install a hotfix from within WindowsJeff Hughes (CORE)15 Feb 2011 10:10 AM22Hello, my name is Emmers Presson. I am a Support Escala... 阅读全文
posted @ 2014-05-14 23:51 jeremyatchina 阅读(679) 评论(0) 推荐(0)
Ubuntu下配置了ssh，但是连接很慢
摘要：ssh登录服务器时总是要停顿等待一下才能连接上,这是因为OpenSSH服务器有一个DNS查找选项UseDNS默认是打开的。UseDNS选项打开状态下,当客户端试图登录OpenSSH服务器时,服务器端先根据客户端的IP地址进行DNS PTR反向查询,查询出客户端的host name，然后根据查询出的客... 阅读全文
posted @ 2014-05-09 01:31 jeremyatchina 阅读(453) 评论(0) 推荐(0)
Fix invisible cursor issue in Ubuntu 13.10
摘要：Fix invisible cursor issue in Ubuntu 13.10Fixing this problem is rather too easy. Open a terminal (Ctrl+Alt+T) and use the following command:gsettings... 阅读全文
posted @ 2014-05-08 22:44 jeremyatchina 阅读(185) 评论(0) 推荐(0)