By Katsumii-Oracle on Jan 15, 2014
Here are the claims from 2 parties.
Both parties claim "processor affinity" and I think they work basically the same.
First from Solaris, I remember this page was created around June,2013.
Oracle Database Runs Best on Oracle Solaris
I think the above page is not very specific. So, I googled. I think the PDF below is a good read.
Oracle Solaris systems running Oracle Database are ideal for mission-critical database applications requiring high performance, best-in-class availability, and unmatched scalability.
Lastly, from Linux side. This white paper was published last month.
What Makes Oracle Linux the Best Platform for Oracle Database 12c (PDF)