[CentOS] How to load balance interrupts of a NIC on the PCI-MSI-edge driver in CentOS? :(

Tue May 21 05:24:09 UTC 2013
Alex Flex <aflexzor at gmail.com>


We run a reverse proxy so our CPU need for that is very small, plus we 
get syn flooded often.. which is why we have the need to be able to load 
between cores, i think it is justified.


On 05/20/2013 10:48 PM, John R Pierce wrote:
> On 5/20/2013 9:53 PM, Alex Flex wrote:
>> a.) Could anyody please help me with a solution so that iam able to
>> balance equally the interrupts on both cores?
>> b.) Is there anyway to actually assign more interrupts to this IRQ (25)
>> or is that something that the kernel discretly takes care of?
> afaik, IRQs from a single device have to be handled serially, you can't
> have more than one active IRQ at the same time.
> so there's really no point in distributing them across multiple CPU
> cores.  let the other cores handle user space and other sorts of IOs.
> SYN flooding is a pathological condition thats not going to happen under
> regular workloads, how does your system handle actual network traffic
> when it approaches network saturation ?