netdev - Re: [Xen-devel] [RFC PATCH 3/6] netback: switch to NAPI + kthread model

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Date:	Fri, 13 Jan 2012 18:21:25 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	<ian.campbell@...rix.com>, <konrad.wilk@...cle.com>,
	<xen-devel@...ts.xensource.com>, <netdev@...r.kernel.org>
Subject: Re: [Xen-devel] [RFC PATCH 3/6] netback: switch to NAPI + kthread
 model

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
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