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From: Palmer Dabbelt <palmer@dabbelt.com>
To: mcroce@linux.microsoft.com, mcroce@linux.microsoft.com
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org,
	Paul Walmsley <paul.walmsley@sifive.com>,
	aou@eecs.berkeley.edu, Atish Patra <Atish.Patra@wdc.com>,
	kernel@esmil.dk, akira.tsukamoto@gmail.com, drew@beagleboard.org,
	bmeng.cn@gmail.com, David.Laight@aculab.com, guoren@kernel.org,
	Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] riscv: use the generic string routines
Date: Wed, 04 Aug 2021 13:40:16 -0700 (PDT)	[thread overview]
Message-ID: <mhng-7b8d3a12-e223-4b69-a35a-617b0d7ac8f7@palmerdabbelt-glaptop> (raw)
In-Reply-To: <CAFnufp1QpMc87+-hwPa887iQQGCjjkGNanVSKOUsE-0ti82jrA@mail.gmail.com>

On Tue, 03 Aug 2021 09:54:34 PDT (-0700), mcroce@linux.microsoft.com wrote:
> On Mon, Jul 19, 2021 at 1:44 PM Matteo Croce <mcroce@linux.microsoft.com> wrote:
>>
>> From: Matteo Croce <mcroce@microsoft.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@microsoft.com>
>> Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
>> ---
>
> Hi,
>
> can someone have a look at this change and share opinions?

This LGTM.  How are the generic string routines landing?  I'm happy to 
take this into my for-next, but IIUC we need the optimized generic 
versions first so we don't have a performance regression falling back to 
the trivial ones for a bit.  Is there a shared tag I can pull in?

  reply	other threads:[~2021-08-04 20:40 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 11:43 Matteo Croce
2021-08-03 16:54 ` Matteo Croce
2021-08-04 20:40   ` Palmer Dabbelt [this message]
2021-08-05  8:20     ` David Laight
2021-08-05 10:31     ` Matteo Croce
2021-09-11  3:49       ` Palmer Dabbelt
2021-09-11 17:26         ` David Laight
2021-09-12  0:10         ` Guo Ren
2021-09-13 11:35           ` David Laight
2021-09-19 19:13             ` Matteo Croce

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