From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Stephen Hemminger" <stephen@networkplumber.org>
Cc: "Honnappa Nagarahalli" <Honnappa.Nagarahalli@arm.com>,
"Konstantin Ananyev" <konstantin.v.ananyev@yandex.ru>,
<dev@dpdk.org>, "Bruce Richardson" <bruce.richardson@intel.com>,
"Jan Viktorin" <viktorin@rehivetech.com>,
"Ruifeng Wang" <Ruifeng.Wang@arm.com>,
"David Christensen" <drc@linux.vnet.ibm.com>,
"Stanislaw Kardach" <kda@semihalf.com>, "nd" <nd@arm.com>
Subject: RE: [RFC v2] non-temporal memcpy
Date: Thu, 28 Jul 2022 11:00:28 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D871FE@smartserver.smartshare.dk> (raw)
In-Reply-To: <20220727121207.0814169b@hermes.local>
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Wednesday, 27 July 2022 21.12
[RFC v2] non-temporal memcpy
>
> On Wed, 27 Jul 2022 20:49:59 +0200
> Morten Brørup <mb@smartsharesystems.com> wrote:
>
> > I'm considering rte_memcpy_nt() a performance optimized variant of
> memcpy(), where the performance gain is less cache pollution. Thus,
> silent fallback to memcpy() should suffice.
>
>
> Have you looked at existing Glibc code? last time I checked it was
> already doing
> non-temporal instructions on several architectures.
Good idea!
I found the glibc implementation of memcpy() [1], and it only uses non-temporal store, not non-temporal load; and only for big lengths.
BTW, this also reveals that memcpy() sometimes behaves differently than rte_memcpy(), which never uses non-temporal store.
[1] https://elixir.bootlin.com/glibc/latest/source/sysdeps/x86_64/multiarch/memcpy-ssse3.S
next prev parent reply other threads:[~2022-07-28 9:00 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 15:26 Morten Brørup
2022-07-19 18:00 ` David Christensen
2022-07-19 18:41 ` Morten Brørup
2022-07-19 18:51 ` Stanisław Kardach
2022-07-19 22:15 ` Morten Brørup
2022-07-21 23:19 ` Konstantin Ananyev
2022-07-22 10:44 ` Morten Brørup
2022-07-24 13:35 ` Konstantin Ananyev
2022-07-24 22:18 ` Morten Brørup
2022-07-29 10:00 ` Konstantin Ananyev
2022-07-29 10:46 ` Morten Brørup
2022-07-29 11:50 ` Konstantin Ananyev
2022-07-29 17:17 ` Morten Brørup
2022-07-29 22:00 ` Konstantin Ananyev
2022-07-30 9:51 ` Morten Brørup
2022-08-02 9:05 ` Konstantin Ananyev
2022-07-29 12:13 ` Konstantin Ananyev
2022-07-29 16:05 ` Stephen Hemminger
2022-07-29 17:29 ` Morten Brørup
2022-08-07 20:40 ` Mattias Rönnblom
2022-08-09 9:24 ` Morten Brørup
2022-08-09 11:53 ` Mattias Rönnblom
2022-10-09 16:16 ` Morten Brørup
2022-07-29 18:13 ` Morten Brørup
2022-07-29 19:49 ` Konstantin Ananyev
2022-07-29 20:26 ` Morten Brørup
2022-07-29 21:34 ` Konstantin Ananyev
2022-08-07 20:20 ` Mattias Rönnblom
2022-08-09 9:34 ` Morten Brørup
2022-08-09 11:56 ` Mattias Rönnblom
2022-08-10 21:05 ` Honnappa Nagarahalli
2022-08-11 11:50 ` Mattias Rönnblom
2022-08-11 16:26 ` Honnappa Nagarahalli
2022-07-25 1:17 ` Honnappa Nagarahalli
2022-07-27 10:26 ` Morten Brørup
2022-07-27 17:37 ` Honnappa Nagarahalli
2022-07-27 18:49 ` Morten Brørup
2022-07-27 19:12 ` Stephen Hemminger
2022-07-28 9:00 ` Morten Brørup [this message]
2022-07-27 19:52 ` Honnappa Nagarahalli
2022-07-27 22:02 ` Stanisław Kardach
2022-07-28 10:51 ` Morten Brørup
2022-07-29 9:21 ` Konstantin Ananyev
2022-08-07 20:25 ` Mattias Rönnblom
2022-08-09 9:46 ` Morten Brørup
2022-08-09 12:05 ` Mattias Rönnblom
2022-08-09 15:00 ` Morten Brørup
2022-08-10 11:47 ` Mattias Rönnblom
2022-08-09 15:26 ` Stephen Hemminger
2022-08-09 17:24 ` Morten Brørup
2022-08-10 11:59 ` Mattias Rönnblom
2022-08-10 12:12 ` Morten Brørup
2022-08-10 11:55 ` Mattias Rönnblom
2022-08-10 12:18 ` Morten Brørup
2022-08-10 21:20 ` Honnappa Nagarahalli
2022-08-11 11:53 ` Mattias Rönnblom
2022-08-11 22:24 ` Honnappa Nagarahalli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=98CBD80474FA8B44BF855DF32C47DC35D871FE@smartserver.smartshare.dk \
--to=mb@smartsharesystems.com \
--cc=Honnappa.Nagarahalli@arm.com \
--cc=Ruifeng.Wang@arm.com \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=drc@linux.vnet.ibm.com \
--cc=kda@semihalf.com \
--cc=konstantin.v.ananyev@yandex.ru \
--cc=nd@arm.com \
--cc=stephen@networkplumber.org \
--cc=viktorin@rehivetech.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).