linux-kernel - Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux

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Message-ID: <55FC1B40.9000401@citrix.com>
Date:	Fri, 18 Sep 2015 15:10:08 +0100
From:	Julien Grall <julien.grall@...rix.com>
To:	Roger Pau Monné <roger.pau@...rix.com>,
	<xen-devel@...ts.xenproject.org>
CC:	<wei.liu2@...rix.com>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <konrad.wilk@...cle.com>,
	<linux-kernel@...r.kernel.org>, <david.vrabel@...rix.com>,
	<boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux

Hi Roger,

On 14/09/15 13:08, Roger Pau Monné wrote:
> Well, absolute numbers together with the standard deviation are IMHO the
> best way to provide those figures (ie: see ministat(1) output for
> example), but percentages should also be fine.
> 
> I'm just interested in knowing the performance difference between having
> this patches applied or not when using 4KB pages on the frontend and the
> backend.

I did some benchmark:
	DOM0: 1 VCPU, 4G of RAM based on 4.3-rc1 without this series
	GUEST: 4 VPUs, 4G of RAM, second disk associate to a nullbk device

I used fio with the following options

42sh> fio --name=test --ioengine=libaio --rw=read --numjobs=8 \
--iodepth=32 --time_based=1 --runtime=30 --bs=4KB \
--filename=/dev/xvdb--direct=1 --group_reporting=1 --iodepth_batch=16

The guest is also based on 4.3-rc1 with and without the series.

The overhead with my series is about 0.56%.

Regards,

-- 
Julien Grall
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