Two usb video capture stick with em28xx driver 
get http://mcentral.de/hg/~mrec/em28xx-new/ ... tip.tar.gz and untar
cd em28xx-new-*
make
find /lib/modules/$(uname -r) -name "em28xx*" -type f | xargs rm -rf
find /lib/modules/$(uname -r) -name "tvp5150.ko" -type f | \
xargs rm -rf
mkdir -p /lib/modules/$(uname -r)/empia
cp *.ko /lib/modules/$(uname -r)/empia
cp tvp5150/tvp5150*.ko *.ko /lib/modules/$(uname -r)/empia
strip -d /lib/modules/$(uname -r)/empia/*.ko
depmod -a

/etc/modprobe.d/local
options em28xx card=14 vbi_mode=0 alt=4
options em28xx card=43 vbi_mode=0 alt=2
These two options lines are really working

With alt i use a lower bandwidth for usb

For Kernel >= 2.6.27 card indexes changed, no alt setting is needed and only one option line in /etc/modprobe.d/local is working:

options em28xx card=9,38

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io scheduler for databases (deadline) 
As suggested by http://www.nextre.it/oracledocs/oraclemyths.html
i put elevator=deadline to grubs menu.lst.

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atomic ops in c with help of gcc 
atomic.h Read More...

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find PCs in a network 
for i in $(seq 2 254); do ping -c 1 192.168.0.$i | grep -q rtt && echo "found 192.168.0.$i"; done

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kvm pxe boot 
get a ISO bootable image without legacy floppy emulation (.iso) from etherboot

kvm.sh:
#!/bin/sh

switch=br0

USERID=$(whoami)
iface=$(sudo tunctl -b -u $USERID)

sudo /usr/sbin/brctl addbr $switch
sudo /sbin/ifconfig $switch 192.168.99.1 up

kvm -M pc -m 512 -smp 1 -cdrom eb-5.4.3-ns8390.iso \
-boot d -net nic,model=rtl8139 \
-net tap,vlan=0,ifname=$iface, \
script=qemu-ifup,downscript=qemu-ifdown

sudo tunctl -d $iface &> /dev/null

sudo /sbin/ifconfig br0 down
sudo /usr/sbin/brctl delbr $switch
qemu-ifup:
#!/bin/sh

#!/bin/sh

switch=br0

if [ -n "$1" ];then
echo "config $1"
/usr/bin/sudo /sbin/ifconfig $1 0.0.0.0 promisc up
/usr/bin/sudo /usr/sbin/brctl addif $switch $1
exit 0
else
echo "Error: no interface specified"
exit 1
fi
qemu-ifdown:
#!/bin/sh

switch=br0

if [ -n "$1" ];then
sudo tunctl -d $1
sudo ifconfig $switch down
exit 0
else
echo "Error: no interface specified"
exit 1
fi


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