From: Stephen Hemminger <shemminger@osdl.org>
To: linux-kernel@vger.kernel.org
Subject: Re: [openib-general] Re: [PATCH 07/16] ehca: interrupt handling routines
Date: Tue, 9 May 2006 12:04:21 -0700 [thread overview]
Message-ID: <20060509120421.6ac3f15c@localhost.localdomain> (raw)
In-Reply-To: <40FCD6B6-9135-43C1-8974-E9070475DB78@schihei.de>
On Tue, 9 May 2006 20:57:01 +0200
Heiko J Schick <info@schihei.de> 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.
next prev parent reply other threads:[~2006-05-09 19:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4450A196.2050901@de.ibm.com>
2006-05-04 21:29 ` [openib-general] " Roland Dreier
2006-05-05 13:05 ` Heiko J Schick
2006-05-05 14:49 ` Roland Dreier
2006-05-09 12:35 ` Heiko J Schick
2006-05-09 16:23 ` Roland Dreier
2006-05-09 16:49 ` Michael S. Tsirkin
[not found] ` <OF22D08323.20D303C1-ON87257169.0063C980-88257169.006A41AB@us.ibm.com>
2006-05-09 18:36 ` [openib-general] " Roland Dreier
2006-05-09 18:44 ` Michael S. Tsirkin
[not found] ` <OF9332FF11.38007290-ON87257169.00673F71-88257169.006C7F6E@us.ibm.com>
2006-05-09 18:55 ` Michael S. Tsirkin
2006-05-09 18:57 ` [openib-general] " Heiko J Schick
2006-05-09 19:04 ` Stephen Hemminger [this message]
[not found] ` <OF6CAB9865.804CAFBB-ON87257169.006C3DBC-88257169.00718277@us.ibm.com>
2006-05-09 20:20 ` Michael S. Tsirkin
[not found] ` <OFD1053717.15B4F49A-ON87257169.007531E1-88257169.007AD29E@us.ibm.com>
2006-05-10 5:33 ` Michael S. Tsirkin
2006-05-09 23:35 ` [openib-general] " Segher Boessenkool
2006-05-09 13:15 ` Christoph Hellwig
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