On 9 October 2011 13:00, Riyaj Shamsudeen <riyaj.shamsudeen@xxxxxxxxx> wrote: > Hello Jed > NIC cards interrupt CPU for the packet delivery. Of course, in a busy RAC > database, there can be huge amount of network packets being transferred > leading to high IRQs. If IRQs are pinned to be interrupted to one CPU, then > latency in that CPU can cause issues as kernel threads need to be scheduled > to serve the irqs only in that CPU. Wonder what type of NIC card he is using.. A NIC card thats support TCP-Segmentation-offload would help to reduce IRQ triggers. One can get this information through this command ethtool --show-offload eth0 -- //www.freelists.org/webpage/oracle-l