Re: Oracle RAC and IRQ Balance
From: William Muriithi <william.muriithi_at_gmail.com>
Date: Sun, 9 Oct 2011 23:52:40 -0400
Message-ID: <CAE9rU+7oK0RHj_pNdvQPnuU_GGqa_RvXkKU37CFM169R0S2Xrw_at_mail.gmail.com>
On 9 October 2011 13:00, Riyaj Shamsudeen <riyaj.shamsudeen_at_gmail.com> 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.
Date: Sun, 9 Oct 2011 23:52:40 -0400
Message-ID: <CAE9rU+7oK0RHj_pNdvQPnuU_GGqa_RvXkKU37CFM169R0S2Xrw_at_mail.gmail.com>
On 9 October 2011 13:00, Riyaj Shamsudeen <riyaj.shamsudeen_at_gmail.com> 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
-- http://www.freelists.org/webpage/oracle-lReceived on Sun Oct 09 2011 - 22:52:40 CDT