Question regarding FAQ - Some Latency Solutions: isol

I got a question regarding this section in FAQ - Some Latency Solutions :

Instead of running a CPU Hog, a far more elegant solution can be to use isolcpus
wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Is..._Parameter_And_GRUB2

Here by use of a kernel parameter at boot time, all bar the >highest< number processor core are isolated from use and you are back to a single processor dominated by the real time processes again.

Maybe I got it all wrong, but shouldn't that read "all bar the >lowest< number processor core are isolated" if for a 4 core cpu isocpus is set at "isolcpus=1,2,3"?

greez chris

Lowest cpu is 0, that remains in use, the others are isolated and not used.
That has the downside of bringing the PC to a single processor so everything will be sluggish, and in recent PC's has low or no real benefit in latency.