Thursday, September 01, 2011

Speedup KVM disk access



http://arstechnica.com/civis/viewtopic.php?f=16&t=1143694


virsh -c qemu:///system edit devubuntu


change from
        <driver name='qemu' type='raw'/>
to
        <driver name='qemu' type='raw' cache='none'/>

找出所有行尾含有空白字元的檔案


find . -name *.[ch] | xargs egrep -l "[[:space:]]+$"

Friday, May 06, 2011

Flush Disk Cache

sync; echo 3 > /proc/sys/vm/drop_caches

NFS client


$ sudo apt-get install nfs-common
$ showmount -e 192.168.63.1
Export list for 192.168.63.1:
/tvixhd1 (everyone)
/tvixhd2 (everyone)
/tvixhd3 (everyone)
/tvixhd4 (everyone)
$ mkdir qq
$ sudo mount -t nfs 192.168.63.1:/tvixhd1 qq

Windows 上的免費 NFS server

Here is a list of free NFS server for Windows:
http://www.serassio.it/download/download.htm
http://sourceforge.net/projects/winnfsd/

http://sourceforge.net/projects/sossnt/

Friday, April 01, 2011

免安裝 dos2unix 就可以達到一樣的效果

cat orig_file | col -b > new_file
tr -d "\015" < orig_file > new_file

你說那 unix2dos 呢?
對不起,沒有這種需要。

Install telnetd

如果只是為了要開發用,在 virtual machine 上裝 SSH server 實在是有點浪費 CPU,因為中間的連線都是在本機上,卻還要做不必要的 encryption/decryption。

可以只裝 telnetd 就好了,像這樣:

sudo apt-get install telnetd
sudo /etc/init.d/openbsd-inetd start

然後就可以 telnet 進去了,心裡上會快一點。