DPDK usage discussions
 help / color / mirror / Atom feed
From: Mike Shang <mshang5@gmail.com>
To: users@dpdk.org
Subject: [dpdk-users] Performance gain from switching to vector PMD
Date: Fri, 7 Jul 2017 10:44:34 +0800	[thread overview]
Message-ID: <CAB6_+DwvOXZQSX2hNuDSyCnAS9nB-isLomZ7c2vZ670YDe+fvA@mail.gmail.com> (raw)

Hi,
I tried to enable vector i40e for an existing dpdk application just found
that no performance gain is resulted. Is there anything we have to tune
when using vPMD ? I have gone through the dpdk document but found nothing
relevant. Any suggestions ? Or the benefits of vPMD are just not that
significant ?

ps.
I'm using 17.05 on Intel sandy bridge CPU. I have set RET_MACHINE to snb
for enabling SSE needed for vPMD. Also the preconditions required for using
I40E vPMD are missing in the document for I40E but are there in the IXGBE
sections. rx_free_thresh is at 32 to fulfill the precondition and I'm sure
vector is enablen from checking the log, that rx_vec_allowed and
rx_bulk_alloc_allowed are both true.

Thanks.

                 reply	other threads:[~2017-07-07  2:44 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=CAB6_+DwvOXZQSX2hNuDSyCnAS9nB-isLomZ7c2vZ670YDe+fvA@mail.gmail.com \
    --to=mshang5@gmail.com \
    --cc=users@dpdk.org \
    /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).