On 09/20/2011 06:31 PM, Mathieu Desnoyers wrote: > I don't think lwsync orders non-cacheable memory operations. Therefore, > is it the right choice for cmm_rmb/cmm_wmb ? I think you're right. "eieio;lwsync" is good for rmb, lwsync is good for wmb/smp_rmb/smp_wmb. Paolo