Re: Oracle RAC and IRQ Balance

  • From: William Muriithi <william.muriithi@xxxxxxxxx>
  • To: riyaj.shamsudeen@xxxxxxxxx
  • Date: Sun, 9 Oct 2011 23:52:40 -0400

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

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