On Thu, Jun 18, 2009 at 02:13:11AM +0200, Kevin Kofler wrote: > David Woodhouse wrote: > > I'm after a system-wide answer, not a microbenchmark for zlib or crypto > > code. It should take into account any overheads involved in > > saving/restoring registers on context switch that wouldn't otherwise > > have to be saved/restored. > > Doesn't the kernel have to save/restore them anyway? Or how does it know > that a program doesn't contain any SSE assembly? > Turn off the fpu, let it trap, set a flag, restart the instruction with the fpu enabled, if it happens often enough on the task, do it unconditionally. Magic. Kyle -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
