linux-kernel - Re: [Xen-devel] [PATCH v2 00/20] xen/arm64: Add support for 64KB page

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Message-ID: <55AD35F0.3090706@citrix.com>
Date:	Mon, 20 Jul 2015 18:54:56 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	<xen-devel@...ts.xenproject.org>
CC:	<wei.liu2@...rix.com>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	<david.vrabel@...rix.com>, <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>, <roger.pau@...rix.com>
Subject: Re: [Xen-devel] [PATCH v2 00/20] xen/arm64: Add support for 64KB
 page

On 09/07/15 21:42, Julien Grall wrote:
> Average betwen 10 iperf :
> 
> DOM0	    Guest       Result
> 
> 4KB-mod	    64KB        3.176 Gbits/sec
> 4KB-mod     4KB-mod     3.245 Gbits/sec
> 4KB-mod     4KB         3.258 Gbits/sec
> 4KB         4KB         3.292 Gbits/sec
> 4KB         4KB-mod     3.265 Gbits/sec
> 4KB         64KB        3.189 Gbits/sec
> 
> 4KB-mod: Linux with the 64KB patch series
> 4KB: linux/master
> 
> The network performance is slightly worst with this series (-0.15%). I suspect,
> this is because of using an indirection to setup the grant. This is necessary
> in order to ensure that the grant will be correctly sized no matter of the
> Linux page granularity. This could be used later in order to support bigger
> grant.

I didn't compute correctly the result. It's -1.5% and not -0.15% sorry.

-- 
Julien Grall
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