From: Stephen Hemminger <stephen@networkplumber.org>
To: Venumadhav Josyula <vjosyula@gmail.com>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] Drops seems with virtio PMD driver
Date: Thu, 29 Aug 2019 07:40:01 -0700 [thread overview]
Message-ID: <20190829074001.578153a8@hermes.lan> (raw)
In-Reply-To: <CA+i0PGW9zhN66RCKUc21DXzdqF+exXnOhdW+ucNo4LqUmAYQ2g@mail.gmail.com>
On Thu, 29 Aug 2019 10:12:27 +0530
Venumadhav Josyula <vjosyula@gmail.com> wrote:
> Hi All,
>
> We are observing packet drops ~@90Mbs with virtio pmd driver. These packets
> are not been
> queued in the tx descriptors, the function 'rte_eth_tx_burst' is returning
> the less than n.
>
> So questions are following
> i) are there any issues seen ?
>
> Observations in our case :-
> i) packets are dropped and tx packets donot get incremented.
> ii) i) happens for 30 secs after that it recovers.
> iii) After sometime we see this issue in i) & ii) again.
>
> Any clues / pointers will help.
>
> Thanks,
> Regards,
> Venu
The number of transmit descriptors is fixed.
If you are producing packets faster than the other consume them then the
transmit descriptor ring gets full. So the problem is probably on the other
side of your virtio. Are you using KVM? Did you enable virtio net acceleration?
next prev parent reply other threads:[~2019-08-29 14:40 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-29 4:42 Venumadhav Josyula
2019-08-29 14:40 ` Stephen Hemminger [this message]
2019-08-29 14:42 ` Venumadhav Josyula
2019-08-29 14:56 ` Stephen Hemminger
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=20190829074001.578153a8@hermes.lan \
--to=stephen@networkplumber.org \
--cc=users@dpdk.org \
--cc=vjosyula@gmail.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).