From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [Xen-devel] [RFC PATCH 3/6] netback: switch to NAPI + kthread
 model
Date: Mon, 16 Jan 2012 09:33:14 +0000
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To: David Vrabel <david.vrabel@citrix.com>
Cc: wei.liu2@citrix.com, Ian Campbell <Ian.Campbell@citrix.com>, "konrad.wilk@oracle.com" <konrad.wilk@oracle.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>
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On Fri, 2012-01-13 at 18:21 +0000, David Vrabel wrote:
> On 13/01/12 16:59, Wei Liu wrote:
> > This patch implements 1:1 model netback. We utilizes NAPI and kthread
> > to do the weight-lifting job:
> > 
> >   - NAPI is used for guest side TX (host side RX)
> >   - kthread is used for guest side RX (host side TX)
> > 
> > This model provides better scheduling fairness among vifs. It also
> > lays the foundation for future work.
> > 
> > The major defect for the current implementation is that in the NAPI
> > poll handler we don't actually disable interrupt. Xen stuff is
> > different from real hardware, it requires some other tuning of ring
> > macros.
> 
> RING_FINAL_CHECK_FOR_REQUESTS() looks it does the correct thing to me.
> 
> David

I need to stop the other end from generating events, so
RING_FINAL_CHECK_FOR_REQUESTS is not the right answer I think.


Wei.