linux-kernel - Re: [PATCH] riscv: use the generic string routines

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Message-ID: <CAFnufp1QpMc87+-hwPa887iQQGCjjkGNanVSKOUsE-0ti82jrA@mail.gmail.com>
Date:   Tue, 3 Aug 2021 18:54:34 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     linux-riscv <linux-riscv@...ts.infradead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <atish.patra@....com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Akira Tsukamoto <akira.tsukamoto@...il.com>,
        Drew Fustini <drew@...gleboard.org>,
        Bin Meng <bmeng.cn@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Guo Ren <guoren@...nel.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] riscv: use the generic string routines

On Mon, Jul 19, 2021 at 1:44 PM Matteo Croce <mcroce@...ux.microsoft.com> wrote:
>
> From: Matteo Croce <mcroce@...rosoft.com>
>
> Use the generic routines which handle alignment properly.
>
> These are the performances measured on a BeagleV machine for a
> 32 mbyte buffer:
>
> memcpy:
> original aligned:        75 Mb/s
> original unaligned:      75 Mb/s
> new aligned:            114 Mb/s
> new unaligned:          107 Mb/s
>
> memset:
> original aligned:       140 Mb/s
> original unaligned:     140 Mb/s
> new aligned:            241 Mb/s
> new unaligned:          241 Mb/s
>
> TCP throughput with iperf3 gives a similar improvement as well.
>
> This is the binary size increase according to bloat-o-meter:
>
> add/remove: 0/0 grow/shrink: 4/2 up/down: 432/-36 (396)
> Function                                     old     new   delta
> memcpy                                        36     324    +288
> memset                                        32     148    +116
> strlcpy                                      116     132     +16
> strscpy_pad                                   84      96     +12
> strlcat                                      176     164     -12
> memmove                                       76      52     -24
> Total: Before=1225371, After=1225767, chg +0.03%
>
> Signed-off-by: Matteo Croce <mcroce@...rosoft.com>
> Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
> ---

Hi,

can someone have a look at this change and share opinions?

Regards,
-- 
per aspera ad upstream