Mike reported a 13% drop in netperf TCP_RR performance due to the
new remote wakeup code. Suresh too noticed some performance issues
with it.

Reducing the IPIs to only cross cache domains solves the observed
performance issues.
Reported-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Reported-by: NMike Galbraith <efault@gmx.de>
Acked-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Acked-by: NMike Galbraith <efault@gmx.de>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Dave Kleikamp <dave.kleikamp@oracle.com>
Link: http://lkml.kernel.org/r/1323338531.17673.7.camel@twinsSigned-off-by: NIngo Molnar <mingo@elte.hu>