Oracle Gentoo memory sharing

http://gentoo-wiki.com/HOWTO_Install_Oracle_10g#Setting_Limits_for_the_Maximum_Number_of_Open_File_Descriptors_for_the_Oracle_User

you have to add
echo 250 32000 100 128 > /proc/sys/kernel/sem
echo 2147483648 > /proc/sys/kernel/shmmax
echo 4096 > /proc/sys/kernel/shmmni
to /etc/sysctl.conf