Re: [RFC] NAPI as kobject proposal

David Miller
2010-02-04T02:17:02Z

From: Stephen Hemminger <shemminger@vyatta.com>
Date: Wed, 3 Feb 2010 17:58:46 -0800

> The usage model I see is wanting to have:
> 1. only some cores being used for receive traffic
> on single Rx devices (NAPI)
> 2. only some cores being used for receive traffic
> on legacy devices (non-NAPI)
> 3. being able to configure a set of cpus with same
> IRQ/cache when doing Rx multi-queue. Assign MSI-X
> IRQ per core and allow both HT on core to split
> that RX traffic.
>
> All this should be manageable by some user utility like irqbalance.
>
> #1 and #2 argue for a per device map (like irq_affinity) but
> #3 is harder; not sure the right API for that.

Do you think the people setting RPS maps aren't capable of
configuring IRQ affinities? :-)