net: add cpu_relax to busy poll loop
net: add cpu_relax to busy poll loop

Add a cpu_relaxt to sk_busy_loop.

Julie Cummings reported performance issues when hyperthreading is on.
Arjan van de Ven observed that we should have a cpu_relax() in the
busy poll loop.

Reported-by: Julie Cummings <9b1e5bb351f7a3a7e1546311e14a3dac3d5d1ef4@intel.com>
Signed-off-by: Eliezer Tamir <6b6063e36ca1bb86c1f2fa35aeb1f7937c6273cb@linux.intel.com>
Signed-off-by: David S. Miller <fe08d3c717adf2ae63592e4c9aec6e3e404d8e3e@davemloft.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs