[takeda]

Do you remember which FreeBSD version and which Linux kernel version was it?

Linux had tickless kernel + CPU scaling for a while. FreeBSD is lagging in this aspect.

[profquail]

The FreeBSD kernel is tickless as of FreeBSD 10:

http://www.freebsdnews.net/2013/09/20/freebsd-10s-new-techno...

[takeda]

Yes, exactly, it only has it for couple of months, that's why I asked about version.