linux-kernel - Re: [PATCH v7 00/20] ILP32 for ARM64

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Date:   Thu, 16 Feb 2017 16:23:20 +0300
From:   Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>
To:     Andrew Pinski <apinski@...ium.com>
Cc:     Yury Norov <ynorov@...iumnetworks.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
        "linux-arch @ vger . kernel . org Arnd Bergmann" <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Adam Borowski <kilobyte@...band.pl>,
        Chris Metcalf <cmetcalf@...hip.com>,
        Steve Ellcey <sellcey@...iumnetworks.com>,
        Ramana Radhakrishnan <ramana.gcc@...glemail.com>,
        Florian Weimer <fweimer@...hat.com>,
        Bamvor Zhangjian <bamvor.zhangjian@...wei.com>,
        Andreas Schwab <schwab@...e.de>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Mark Brown <broonie@...nel.org>,
        "Joseph S. Myers" <joseph@...esourcery.com>,
        christoph.muellner@...obroma-systems.com,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        Alexey Klimov <klimov.linux@...il.com>,
        Nathan Lynch <Nathan_Lynch@...tor.com>,
        Alexander Graf <agraf@...e.de>,
        Prasun Kapoor <Prasun.Kapoor@...iumnetworks.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        manuel.montezelo@...il.com, linyongting@...wei.com,
        David Miller <davem@...emloft.net>, zhouchengming1@...wei.com
Subject: Re: [PATCH v7 00/20] ILP32 for ARM64

> On Feb 12, 2017, at 4:07 PM, Andrew Pinski <apinski@...ium.com> wrote:
> 
> On Mon, Jan 9, 2017 at 3:29 AM, Yury Norov <ynorov@...iumnetworks.com> wrote:
>> This series enables aarch64 with ilp32 mode.
>> 
...
> 
> For folks concerned about performance, here is what we get for SPEC
> CPU 2006 on ThunderX 2 CN99xx.
> Positive means ILP32 is faster than LP64.  This core does not have
> AARCH32 so I can't compare that.
> Also my LP64 scores don't change with and without the patches.
> 
> Options:
> -Ofast -flto=32 -mcpu=native -fno-aggressive-loop-optimizations
> -funroll-loops -fprefetch-loop-arrays
> GCC 7.0.1 r245361 with ilp32 multi-arch patch applied.
> 4.10rc2 Plus ILP32 patches
> 
> SPEC CPU 2006 INT ILP32/LP64
> 400.perlbench           5.23%
> 401.bzip2                  7.83%
> 403.gcc                     6.22%
> 429.mcf                     14.25%
> 445.gobmk                 -1.33%
> 456.hmmer                 -0.61%
> 458.sjeng                    0.00%
> 462.libquantum            -7.38%
> 464.h264ref                 10.86%
> 471.omnetpp               13.53%
> 473.astar                      1.38%
> 483.xalancbmk             3.73%
> Score                            4.29%
> 
> Rate (32):
> 400.perlbench           6.10%
> 401.bzip2                  7.10%
> 403.gcc                     6.71%
> 429.mcf                     57.29%
> 445.gobmk                -0.87%
> 456.hmmer                -0.19%
> 458.sjeng                  0.22%
> 462.libquantum         0.00%
> 464.h264ref              11.19%
> 471.omnetpp            11.80%
> 473.astar                  -0.29%
> 483.xalancbmk         8.87%
> Score                       8.12%

These are good numbers and show that ILP32 has performance advantage over LP64.

SPEC CPU2006 is a user-land benchmark and spends almost no time in the kernel (by design).  Similar results for a kernel-focused benchmark would be highly interesting too, and kernel reviewers have asked for these a couple of times.  Do you plan to run kernel benchmarks on the hardware you have?

Thanks,

--
Maxim Kuvyrkov
www.linaro.org