I was fixing the PSE and PAE page table display for GKD, I found out Linux using 4M page to map large address space and it uses 4K page to map broken space. So advance OS should mix use of 4K and 4M page.   Now GKD supports PSE=1 (4M page) 2014/07/27

I think i am under dns attack, in my /var/log/message i keep seeing these. Someone is using over 2000 ip to lookup my dns server. 2014/07/12

Just bought a 2nd hand HP server (8core + 16GB ram), cost me $2630 HKD. One 1TB 2.5″ hard disk cost me $450. Total $3080. It reboot only take 20 seconds, dell needs 5 mins (CRAZY!!!)   2014/05/20

Someone asked me in email about using elf-dependency-walker to analyst library or executable in linux. I found out android is using ELF format for its libraries or executables too. So the rest is simple. Please download the android emulator, within the directory there is the system image, which contain the file system. You can see in […] 2014/05/13

I am using ubuntu 12.04 64 bits and trying compile ffmpeg and got this error: libavfilter/x86/vf_pullup.asm:59: error: invalid combination of opcode and operands libavfilter/x86/vf_pullup.asm:138: error: invalid combination of opcode and operands libavfilter/x86/vf_pullup.asm:175: error: invalid combination of opcode and operands To solve this, add “–disable-mmx” to your ./configure 2014/05/13

These are the basic usage of SOX This script will convert ffmpeg HLS into “live streaming HLS” The above script has to run with ffmpeg: /root/download/ffmpeg-2.1.4/ffmpeg -f alsa -ac 2 -i hw:0,0 -strict experimental -acodec libmp3lame -map 0 -f segment -segment_list out.m3u8 -segment_format libmp3lame -segment_time 0.5 -segment_list_flags +live ‘a%05d.mp3’ 2014/05/08

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If you have too many “semantic error” in eclipse CDT, such like this   You can switch it off in project properties but unblock “Syntax and Semantic Errors” 2014/04/22

When ESXi expire, you will see this dialog, so you know what features need money 2014/03/26

Start ovs monitor, look at the tabs’ name, you probably know how many function that OVS offer, this give me a big picture of integrate ova into openstack. 2013/12/22

A very professional ppt that talk about system performance tuning download : scalelinuxperformance-130224171331-phpapp01 2013/04/17

To use qmp and send command to qemu from another process, start qemu by This will create a file /tmp/test.gmp for interchange the command. Then you can start another terminal and invoke command.txt: !!! remark, must invoke { “execute”: “qmp_capabilities” } before invoke any qmp command 2013/03/20

Add this “CATALINA_OPTS=-Djava.awt.headless=true” to catalina.sh 2013/01/31

Font rendering is a matter of taste. However, I personally think Ubuntu’s default font rendering is the most eye-pleasing one of the whole Linux eco-system. And if a website’s CSS font stack is looking good on Ubuntu, you can be relatively sure that it also works for Mac or MS Windows as long as the used fonts are available on these […] 2012/12/13

2012/12/10

just add “–password-store=basic” in the option you start chrome. 2012/12/09