[ubuntu] how to turn off yeild()

I was fooling around with a virtual machine and set it to use two processors..when I tried to start it with vmware workstation..I got a message saying...


The host's Linux kernel yield() functionality is disabled. Multiprocessor virtual machines exhibit degraded performance without yield(). Choose 'OK' to enable the sysctl 'kernel.sched_compat_yield' or 'Cancel' to continue without yield()

I choose yield() option but now I want to disable as I believe now my whole system is running a tad slower and it didnt make any difference in my vm...

I am running Ubuntu 10.10 GNOME...does anyone know how I turn this off again?

I checked some forums and it says to edit the

Add this line to the /etc/sysctl.conf file:

kernel.sched_compat_yield=

setting..

but when I checked this file I didnt find the setting...?

?

Thanks in advance