On Thu, Aug 18, 2011 at 02:03:56PM -0700, Andi Kleen wrote: > > >Is the performance gain because of this one less dereference really > >substantial. > Yes it is measurable on a large macro benchmark. > > The gain is from doing the prefetch early enough, and that needs the > additional pointer. So it gives you extra .3% (as mentioned in your first mail). IMHO, for .3% we should not cache extra request queue pointer. Thanks Vivek -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
