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

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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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[PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:40 +0200
  [PATCH v4 12/20] xen/balloon: Don't rely on the page granularity is the same for Xen and Linux Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:40 +0200
    Re: [PATCH v4 12/20] xen/balloon: Don't rely on the page granularity  is the same for Xen and Linux Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-07 18:50 +0200
  [PATCH v4 15/20] block/xen-blkfront: Make it running on 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
  [PATCH v4 20/20] arm/xen: Add support for 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
  [PATCH v4 17/20] net/xen-netfront: Make it running on 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
  [PATCH v4 10/20] xen/xenbus: Use Xen page definition Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
  [PATCH v4 16/20] block/xen-blkback: Make it running on 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
  [PATCH v4 18/20] net/xen-netback: Make it running on 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-07 17:50 +0200
    Re: [PATCH v4 18/20] net/xen-netback: Make it running on 64KB page  granularity Wei Liu <wei.liu2@citrix.com> - 2015-09-07 19:00 +0200
      Re: [Xen-devel] [PATCH v4 18/20] net/xen-netback: Make it running on  64KB page granularity Wei Liu <wei.liu2@citrix.com> - 2015-09-08 13:10 +0200
      Re: [Xen-devel] [PATCH v4 18/20] net/xen-netback: Make it running  on 64KB page granularity Julien Grall <julien.grall@citrix.com> - 2015-09-08 13:10 +0200
  Re: [Xen-devel] [PATCH v4 00/20] xen/arm64: Add support for 64KB  page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-11 21:50 +0200
  Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Roger Pau Monné <roger.pau@citrix.com> - 2015-09-14 11:00 +0200
    Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-14 12:50 +0200
      Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Roger Pau Monné <roger.pau@citrix.com> - 2015-09-14 13:10 +0200
        Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-14 13:30 +0200
          Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Roger Pau Monné <roger.pau@citrix.com> - 2015-09-14 14:10 +0200
            Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-14 14:50 +0200
              Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Roger Pau Monné <roger.pau@citrix.com> - 2015-09-14 16:40 +0200
                Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-14 16:50 +0200
                Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-14 17:00 +0200
                Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Roger Pau Monné <roger.pau@citrix.com> - 2015-09-14 17:30 +0200
            Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Julien Grall <julien.grall@citrix.com> - 2015-09-18 16:20 +0200
        Re: [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Arnd Bergmann <arnd@arndb.de> - 2015-09-14 13:40 +0200
          Re: [Xen-devel] [PATCH v4 00/20] xen/arm64: Add support for 64KB  page in Linux David Vrabel <david.vrabel@citrix.com> - 2015-09-15 15:20 +0200
            Re: [Xen-devel] [PATCH v4 00/20] xen/arm64: Add support for 64KB page in Linux Arnd Bergmann <arnd@arndb.de> - 2015-09-15 15:30 +0200

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