From: Periklis Akritidis <akritid@niometrics.com>
To: Mario Gianni <m.gianni@engineer.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] problem with rte_pktmbuf_prepend (possible bug?)
Date: Tue, 18 Feb 2014 22:19:36 +0800 [thread overview]
Message-ID: <78841534-98AB-4845-9FAF-CAC975D15D3A@niometrics.com> (raw)
In-Reply-To: <20140218102749.270040@gmx.com>
Hi Mario,
Are you passing rte_pktmbuf_init as the obj_init argument to rte_mempool_create?
It is called when the mbuf if freed and it will reset the fields. I vaguely remember I had the same issue at some point and resolved it somehow. This comes to mind.
Cheers,
Periklis
On 18 Feb, 2014, at 6:27 pm, Mario Gianni <m.gianni@engineer.com> wrote:
> Hi all, I'm experimenting some code with DPDK v1.5.0 and I have the following problem:
>
> I have a thread that receives packets from NIC, once I received a packet I want to prepend some data to it and I try to do so through the function rte_pktmbuf_prepend()
> then the packet is enqueued in a ring buffer where it will be used by a client thread before being dropped through the function rte_pktmbuf_free() called by the client thread.
>
> Now, if I try to send packets to this program I have the following behaviour:
> In a first time it seems to work correctly, then after a certain number of received packets (approximately the same number as the number of mbufs present in the mempool) if I call the rte_pktmbuf_headroom it returns that the headroom is shrinking more than the expected, until after a certain number of packets the headroom goes to zero.
>
> It seems like that when I call the rte_pktmbuf_free() function it doesn't reset the data position inside the mbuf, so when I call for a second time the mbuf the headroom continues to shrink until it finishes.
>
>
> Do you have any idea of this strange behaviour?Could it be a bug in the prepend/free function?
>
>
> Thank you,
>
> Mario
next prev parent reply other threads:[~2014-02-18 14:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-18 10:27 Mario Gianni
2014-02-18 14:19 ` Periklis Akritidis [this message]
2014-02-18 17:16 ` Benson, Bryan
2014-02-19 14:04 Mario Gianni
2014-02-19 17:32 ` Ananyev, Konstantin
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