DPDK patches and discussions
 help / color / mirror / Atom feed
From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Stephen Hemminger" <stephen@networkplumber.org>,
	"Luc Pelletier" <lucp.at.work@gmail.com>
Cc: <bruce.richardson@intel.com>, <konstantin.ananyev@intel.com>,
	"dev" <dev@dpdk.org>, "Xiaoyun Li" <xiaoyun.li@intel.com>,
	"dpdk stable" <stable@dpdk.org>, "Georg Sauthoff" <mail@gms.tf>
Subject: RE: [PATCH v3] eal: fix unaligned loads/stores in rte_memcpy_generic
Date: Sun, 16 Jan 2022 18:59:26 +0100	[thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D86E08@smartserver.smartshare.dk> (raw)
In-Reply-To: <20220116083416.05d7a9db@hermes.local>

> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Sunday, 16 January 2022 17.34
> 
> On Sun, 16 Jan 2022 09:33:19 -0500
> Luc Pelletier <lucp.at.work@gmail.com> wrote:
> 
> > As a side note, and to follow up on Stephen's indication that this is
> > 'performance critical code', I think it might be worthwhile to
> > revisit/revalidate the current implementation of rte_memcpy. There's
> a
> > good thread here that mentions rte_memcpy, and its performance on at
> > least one platform/architecture combination is far from being the
> > best:
> >
> > https://github.com/microsoft/mimalloc/issues/201
> >
> > It seems like enhanced rep movsb could be faster on more recent CPUs,
> > but that's currently not being used in the current implementation of
> > rte_memcpy.
> >
> > I understand some of this may not be directly related to this patch,
> > but whoever looks at this patch might want to provide their thoughts
> > on whether updating rte_memcpy would be worthwhile? I suspect looking
> > at all current public implementations of memcpy (libc, microsoft,
> > compilers builtin implementations, etc.) might help in making
> > improvements.
> 
> I would prefer that rte_memcpy did not exist at all.
> Instead the system library should always be used.
> 
> It is only exists because some architectures have slower code
> in glibc.

I wonder if that is still the case?

Otherwise, DPDK is probably full of obsolete optimizations, which should be eliminated like this:

http://inbox.dpdk.org/dev/20210918114930.245387-1-mail@gms.tf/



  reply	other threads:[~2022-01-16 17:59 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-15 19:41 [PATCH] " Luc Pelletier
2022-01-15 21:39 ` [PATCH v2] " Luc Pelletier
2022-01-15 22:13   ` Stephen Hemminger
2022-01-16 14:09     ` Luc Pelletier
2022-01-16 16:32       ` Stephen Hemminger
2022-01-24 23:21         ` Georg Sauthoff
2022-01-25  7:59           ` Morten Brørup
2022-01-25 19:57           ` Luc Pelletier
2022-01-16 14:13 ` [PATCH v3] " Luc Pelletier
2022-01-16 14:33   ` Luc Pelletier
2022-01-16 16:34     ` Stephen Hemminger
2022-01-16 17:59       ` Morten Brørup [this message]
2022-01-16 20:33 ` [PATCH v4] " Luc Pelletier
2022-01-17 15:37 ` [PATCH v5] " Luc Pelletier
2022-02-04 16:42   ` Luc Pelletier
2022-02-04 17:16   ` Ananyev, Konstantin
2022-02-08 16:53     ` Thomas Monjalon
2022-02-09 15:05     ` Luc Pelletier
2022-02-10 14:04       ` Ananyev, Konstantin
2022-02-10 16:56         ` Luc Pelletier
2022-02-11 15:51           ` Ananyev, Konstantin
2022-02-13 22:31             ` Luc Pelletier
2022-02-14 13:41               ` Ananyev, Konstantin
2022-02-25 15:51 ` [PATCH v6] eal: fix rte_memcpy strict aliasing/alignment bugs Luc Pelletier
2022-02-25 16:38 ` [PATCH v7] " Luc Pelletier
2022-03-10 14:55   ` Ananyev, Konstantin
2022-04-07 15:24     ` David Marchand
2022-04-07 15:32       ` David Marchand
2022-04-07 15:40         ` David Marchand
2022-05-13 19:15           ` Luc Pelletier
2022-05-19 16:41             ` David Marchand
2022-04-08 13:47       ` Luc Pelletier
2022-05-19 16:47       ` David Marchand

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=98CBD80474FA8B44BF855DF32C47DC35D86E08@smartserver.smartshare.dk \
    --to=mb@smartsharesystems.com \
    --cc=bruce.richardson@intel.com \
    --cc=dev@dpdk.org \
    --cc=konstantin.ananyev@intel.com \
    --cc=lucp.at.work@gmail.com \
    --cc=mail@gms.tf \
    --cc=stable@dpdk.org \
    --cc=stephen@networkplumber.org \
    --cc=xiaoyun.li@intel.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).