On Sat, 22 Jan 2011 07:57:21 -0800, S Mathias wrote: > $ time 7z a -mx=9 linux-2.6.37.tar.7z linux-2.6.37.tar; echo; time xz -9 > -z linux-2.6.37.tar; echo; ls -lS was the linux-2.6.37.tar already in cache memory? If not, and you do xz first, you will see more dramatic results. -- Tong (remove underscore(s) to reply) http://xpt.sourceforge.net/techdocs/ http://xpt.sourceforge.net/tools/