From: Gaurav Bansal <zeebee48@gmail.com>
To: users@dpdk.org
Subject: Re: [dpdk-users] packet drops seen once the no of rxd pkts reach the ring size
Date: Thu, 26 Sep 2019 10:45:03 +0530 [thread overview]
Message-ID: <CAFQQEmB1iQ5b=umRay5mLGa9db4XQWh24d2-R1Wc29+sJGudfg@mail.gmail.com> (raw)
In-Reply-To: <CAFQQEmADxbT26BzBHpfeQgX-wHQxKZu8BiT7_5F1LSxbAekgdA@mail.gmail.com>
any suggestions here ?
On Wed, Sep 25, 2019 at 4:09 PM Gaurav Bansal <zeebee48@gmail.com> wrote:
> Hi all,
> I am using dpdk 16.04 library to process the packets on a vmware vm (say
> vm1). The traffic is sent through a client machine using apache bench. I am
> observing an issue when the number of packets reaching the vmxnet3
> interface reaches the descriptor ring size (set to 2048). Till 2048 all the
> packets correctly reach the 'vmxnet3_recv_pkts' function.
>
> But as the number of packets received reaches 2048, i start seeing some
> retransmissions on the client side (as shown by tcpdump on client side).
> Then i captured the packets on the esx host destined to vm1 and it shows
> that all the original packets as well as the corresponding retransmissions
> are reaching vm1. But somehow these packets fail to reach till
> 'vmxnet3_recv_pkts' function (this was found by putting the breakpoint in
> 'vmxnet3_recv_pkts' function and dumping the packet contents, which showed
> that some packets don't reach here).
>
> Now 'vmxnet3_recv_pkts' is the first function which reads the packets from
> the descriptor ring and as the packets are not reaching till here, i am not
> sure on how to debug this further. Possibly some issues related to the ring
> initialization.... I enabled the init & RX logs for vmxnet3, but i don't
> see any error logs as well. I also tried looking at rxq stats and it shows
> 0 all the time :
> (gdb) p rxq->stats
> $1 = {drop_total = 0, drop_err = 0, drop_fcs = 0, rx_buf_alloc_failure = 0}
>
> Can anyone please provide some clues on how to debug this further ? Are
> there any known issues related to this which have been fixed post 16.04
> version ?
> thanks,
> gaurav
>
next prev parent reply other threads:[~2019-09-26 5:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 10:39 Gaurav Bansal
2019-09-26 5:15 ` Gaurav Bansal [this message]
2019-09-26 5:16 ` Stephen Hemminger
2019-09-26 7:55 ` Gaurav Bansal
2019-09-28 8:47 ` [dpdk-users] packet drops with missing rxdIdx count in vmxnet3 Gaurav Bansal
2019-09-30 5:52 ` Gaurav Bansal
2019-09-30 14:59 ` Stephen Hemminger
2019-10-09 6:11 ` Gaurav Bansal
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='CAFQQEmB1iQ5b=umRay5mLGa9db4XQWh24d2-R1Wc29+sJGudfg@mail.gmail.com' \
--to=zeebee48@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).