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From: Stephen Hemminger <stephen@networkplumber.org>
To: PATRICK KEROULAS <patrick.keroulas@radio-canada.ca>
Cc: users@dpdk.org
Subject: Re: [dpdk-users] mlx5 / tcpdump: packet drop
Date: Thu, 23 Jul 2020 16:57:55 -0700	[thread overview]
Message-ID: <20200723165755.46cef46c@hermes.lan> (raw)
In-Reply-To: <CALEF-=CQNwtWouZyrk02sgk5VPzL6-Z79Ven34CPJXhA_Ouddw@mail.gmail.com>

On Thu, 23 Jul 2020 17:10:31 -0400
PATRICK KEROULAS <patrick.keroulas@radio-canada.ca> wrote:

> Hello,
> I'm trying to use tcpdump with dpdk support in order to benefit from
> dpdk performance and nice features from tcpdump, like filters etc.
> Traffic is constant but quite significant, 6 Gbps, captured by Mellanox
> ConnectX-5.
> DPDK standalone works like a charm, no packet drop.
> $ testpmd -w 0000:01:00.0 -w 0000:01:00.1 -- --enable-rx-timestamp
> $ dpdk-pdump -- --pdump 'port=0,queue=*,rx-dev=/tmp/test.pcap'
> However,when using libpcap/tcpdump on exact same hardware and
> dpdk version, 15% of the pkts are dropped by interface:

The libpcap version of packet capture has many copies, and lots
of extra system calls. The performance is likely to be less than doing
a native solution with the kernel.

It may get better in the future.

  reply	other threads:[~2020-07-23 23:58 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-23 21:10 PATRICK KEROULAS
2020-07-23 23:57 ` Stephen Hemminger [this message]
2020-07-24 13:32   ` PATRICK KEROULAS

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