Re: [openib-general] Re: [PATCH 07/16] ehca: interrupt handlingroutines

[Stephen Hemminger]

On Tue, 9 May 2006 20:57:01 +0200
Heiko J Schick <info@xxxxxxxxxx> wrote:

> On 09.05.2006, at 18:49, Michael S. Tsirkin wrote:
> 
> >> The trivial way to do it would be to use the same idea as the current
> >> ehca driver: just create a thread for receive CQ events and a thread
> >> for send CQ events, and defer CQ polling into those two threads.
> >
> > For RX, isn't this basically what NAPI is doing?
> > Only NAPI seems better, avoiding interrupts completely and avoiding  
> > latency hit
> > by only getting triggered on high load ...
> 
> Does NAPI schedules CQ callbacks to different CPUs or stays the callback
> (handling of data, etc.) on the same CPU where the interrupt came in?
> 

NAPI runs callback on same cpu that called netif_rx_schedule. 
This has benefit of cache location and reduces locking overhead.
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