Hi > 1 : The time to do a Context Switches is or not constent ? > it should be more or less constent give or take the cache hits on ram etc... though i could be wrong. look for the function switch_to its is written in asm for the x86 arch. James -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/