From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH 1/3] xen-netback: remove page tracking
	facility
Date: Tue, 28 May 2013 10:21:32 +0100
Message-ID: <51A4771C.9070808@citrix.com>
References: <1369654183-10536-1-git-send-email-wei.liu2@citrix.com>
	<1369654183-10536-2-git-send-email-wei.liu2@citrix.com>
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To: Wei Liu <wei.liu2@citrix.com>
Cc: annie.li@oracle.com, konrad.wilk@oracle.com, ian.campbell@citrix.com, xen-devel@lists.xen.org
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On 27/05/13 12:29, Wei Liu wrote:
> The data flow from DomU to DomU on the same host:
> 
> With tracking facility:
> 
>        copy
> DomU --------> Dom0          DomU
>  |                            ^
>  |____________________________|
>              copy
> 
> In other words, we can always copy page from Dom0, thus removing the
> need for a tracking facility.
> 
>        copy           copy
> DomU --------> Dom0 -------> DomU
> 
> Simple iperf test shows no performance regression (obviously we do two
> copy's anyway):
> 
>   W/  tracking: ~5.3Gb/s
>   W/o tracking: ~5.4Gb/s
> 
> Signed-off-by: Wei Liu <wei.liu2@citrix.com>
> ---
>  drivers/net/xen-netback/netback.c |   77 +------------------------------------
>  1 file changed, 2 insertions(+), 75 deletions(-)

Nice! This is the sort of patch I like.

David