netdev - Re: [PATCH net-next 0/2] xen-netback: Changes around carrier handling

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Message-ID: <20140806000059.GA7315@zion.uk.xensource.com>
Date:	Wed, 6 Aug 2014 01:00:59 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	<zoltan.kiss@...rix.com>, <wei.liu2@...rix.com>,
	<Ian.Campbell@...rix.com>, <david.vrabel@...rix.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH net-next 0/2] xen-netback: Changes around carrier handling

On Tue, Aug 05, 2014 at 04:07:48PM -0700, David Miller wrote:
> From: Zoltan Kiss <zoltan.kiss@...rix.com>
> Date: Mon, 4 Aug 2014 16:20:56 +0100
> 
> > This series starts using carrier off as a way to purge packets when the guest is
> > not able (or willing) to receive them. It is a much faster way to get rid of
> > packets waiting for an overwhelmed guest.
> > The first patch changes current netback code where it relies currently on
> > netif_carrier_ok.
> > The second turns off the carrier if the guest times out on a queue, and only
> > turn it on again if that queue (or queues) resurrects.
> > 
> > Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
> > Signed-off-by: David Vrabel <david.vrabel@...rix.com>
> 
> Applied, but I have some reservations:
> 

Wow, this is fast. I appreciate your speed, but there's still
outstanding issues in the series.

Apart from some comments on maintainability, the biggest problem is that
there's a bug in second patch that needs to be fixed; or I need to be
proved wrong.  We need to set aside some more time to get those
questions answered. I don't think this series is suitable to go in as
is.

DaveM, could you please advise how to deal with this situation?

Wei.
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