From: Antonio Di Bacco <a.dibacco.ks@gmail.com>
To: "Gábor LENCSE" <lencse@hit.bme.hu>
Cc: users@dpdk.org
Subject: Re: rte_eth_tx_burst() always returns 0 in tight loop
Date: Wed, 6 Jul 2022 09:21:28 +0200 [thread overview]
Message-ID: <CAO8pfFmv=f9+fGq26Vt5+t6WnaRV3YXu10_F=7mBoj50AphpdQ@mail.gmail.com> (raw)
In-Reply-To: <2ca6fffa-05df-9882-34e9-6c13dc2cc28f@hit.bme.hu>
I wonder why calling eth_dev_tx_burst in a tight loop doesn't allow to
write the packets into the transmit buffer. Only solution I found is
to include a small delay after the tx_burst that is less than the
estimated serialization time of the packet in order to be able to
saturate the ethernet line.
Anyway I wonder if this is the right approach.
Thx,
Antonio.
On Sun, Jul 3, 2022 at 10:19 PM Gábor LENCSE <lencse@hit.bme.hu> wrote:
>
> Dear Antonio,
>
> According to my experience, the rte_eth_tx_burst() function reports the
> packets as "sent" (by a non-zero return value), when they are still in
> the transmit buffer.
>
> (If you are interested in the details, you can see them in Section 3.6.5
> of this paper: http://www.hit.bme.hu/~lencse/publications/e104-b_2_128.pdf )
>
> Therefore, I think that the return value of 0 may mean that
> rte_eth_tx_burst() can't even commit itself for the future delivery of
> the packets. I could only guess why. E.g. all its resources have been
> exhausted.
>
> Best regards,
>
> Gábor
>
>
> 7/3/2022 5:57 PM keltezéssel, Antonio Di Bacco írta:
> > I'm trying to send packets continuously in a tight loop with a burst
> > size of 8 and packets are 9600 bytes long.
> > If I don't insert a delay after the rte_eth_tx_burst it always returns 0.
> >
> > What's the explanation of this behaviour ?
> >
> > Best regards,
> > Antonio.
>
next prev parent reply other threads:[~2022-07-06 7:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-03 15:57 Antonio Di Bacco
2022-07-03 20:18 ` Gábor LENCSE
2022-07-06 7:21 ` Antonio Di Bacco [this message]
2022-07-06 15:00 ` Stephen Hemminger
2022-07-07 14:30 ` Antonio Di Bacco
2022-09-26 15:36 ` Antonio Di Bacco
2022-09-26 17:24 ` Stephen Hemminger
2022-07-06 15:03 ` Gábor LENCSE
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='CAO8pfFmv=f9+fGq26Vt5+t6WnaRV3YXu10_F=7mBoj50AphpdQ@mail.gmail.com' \
--to=a.dibacco.ks@gmail.com \
--cc=lencse@hit.bme.hu \
--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).