On Fri, Sep 6, 2019 at 7:53 AM Alexander Duyck <alexander.duyck@xxxxxxxxx> wrote: > > From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx> > > Change the logic used to generate randomness in the suffle path so that we > can avoid cache line bouncing. The previous logic was sharing the offset > and entropy word between all CPUs. As such this can result in cache line > bouncing and will ultimately hurt performance when enabled. > > To resolve this I have moved to a per-cpu logic for maintaining a unsigned > long containing some amount of bits, and an offset value for which bit we > can use for entropy with each call. > Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
