netdev - Re: [RFC PATCH 00/13] Persistent grant maps for xen net drivers

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Message-ID: <20150519153901.GH26335@zion.uk.xensource.com>
Date:	Tue, 19 May 2015 16:39:01 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Joao Martins <joao.martins@...lab.eu>
CC:	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<wei.liu2@...rix.com>, <ian.campbell@...rix.com>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<konrad.wilk@...cle.com>
Subject: Re: [RFC PATCH 00/13] Persistent grant maps for xen net drivers

On Tue, May 12, 2015 at 07:18:24PM +0200, Joao Martins wrote:

> There have been recently[3] some discussions and issues raised on
> persistent grants for the block layer, though the numbers above
> show some significant improvements specially on more network intensive
> workloads and provide a margin for comparison against future map/unmap
> improvements.
> 
> Any comments or suggestions are welcome,
> Thanks!

Thanks, the numbers certainly look interesting.

I'm just a bit concerned about the complexity of netback. I've
commented on individual patches, we can discuss the issues there.

Wei.

> Joao
> 
> [1] http://article.gmane.org/gmane.linux.network/249383
> [2] http://bit.ly/1IhJfXD
> [3] http://lists.xen.org/archives/html/xen-devel/2015-02/msg02292.html
> 
> Joao Martins (13):
>   xen-netback: add persistent grant tree ops
>   xen-netback: xenbus feature persistent support
>   xen-netback: implement TX persistent grants
>   xen-netback: implement RX persistent grants
>   xen-netback: refactor xenvif_rx_action
>   xen-netback: copy buffer on xenvif_start_xmit()
>   xen-netback: add persistent tree counters to debugfs
>   xen-netback: clone skb if skb->xmit_more is set
>   xen-netfront: move grant_{ref,page} to struct grant
>   xen-netfront: refactor claim/release grant
>   xen-netfront: feature-persistent xenbus support
>   xen-netfront: implement TX persistent grants
>   xen-netfront: implement RX persistent grants
> 
>  drivers/net/xen-netback/common.h    |  79 ++++
>  drivers/net/xen-netback/interface.c |  78 +++-
>  drivers/net/xen-netback/netback.c   | 873 ++++++++++++++++++++++++++++++------
>  drivers/net/xen-netback/xenbus.c    |  24 +
>  drivers/net/xen-netfront.c          | 362 ++++++++++++---
>  5 files changed, 1216 insertions(+), 200 deletions(-)
> 
> -- 
> 2.1.3
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