I asked here a week or so ago, and referenced an older bug, but haven't seen any comments. Googling, I see others asking about the same. Datum: *every* one I've found is like this: they're all HP DL580's or DL380's, or such. This is being used for heavy-duty scientific computing. Does anyone know if it *will* it seriously affect throughput speed if I turn off irqbalance? It's running 6.4, btw. mark