Hello, I understand that Linux 2.4 has one TSS per CPU now, and that task switching is done in software. From looking at the relevant pieces of code, though, I cannot discern exactly where the state of all the registers is saved/loaded. I see a subset being being saved and loaded in switch_to(). What is it about x86 that allows this to work? Thanks to any and all, Don - 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/