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

[Shirley Ma]

openib-general-bounces at openib.org wrote on 05/09/2006 11:57:01 AM:

> 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?
> 
> Regards,
>    Heiko

My understanding is NAPI handle interrutps CQ callbacks on the same CPU. 
But you could implement NAPI differently, then it doesn't follow the 
native NAPI 
implementation.

Thanks
Shirley Ma
IBM Linux Technology Center
15300 SW Koll Parkway
Beaverton, OR 97006-6063
Phone(Fax): (503) 578-7638
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ozlabs.org/pipermail/linuxppc-dev/attachments/20060509/d582302e/attachment.htm>