From: Stephen Hemminger <stephen@networkplumber.org>
To: Linzhe Lee <slayercat.subscription@gmail.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] mbuf: fix atomic refcnt update synchronization
Date: Fri, 2 Sep 2016 09:51:43 -0700 [thread overview]
Message-ID: <20160902095143.117482f0@xeon-e3> (raw)
In-Reply-To: <CAK_yBkNMQHNG-bLci08HHiOSfcy5zAau6m19KJaVtBYNU_xhMg@mail.gmail.com>
On Sat, 3 Sep 2016 00:31:50 +0800
Linzhe Lee <slayercat.subscription@gmail.com> wrote:
> Thanks for reply, Stephen.
>
>
>
> I'm in x86-64, my cpu is `Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz`.
>
>
>
> When allocation mbuf in program1, and transfer it to program2 for free
> via ring, the program1 might meet assert in allocate mbuf sometimes.
> (`RTE_ASSERT(rte_mbuf_refcnt_read(m) == 0);`)
>
>
>
> but when I using gdb to check it, the refcnt field of mbuf is already
> zero. so I believe the problem came from the cache line problem or
> incorrect optimization.
>
>
>
> When apply this patch, the problem seems solved. I'm submitting it for
> your comments.
Are you sure you have REFCNT_ATOMIC set?
next prev parent reply other threads:[~2016-09-02 16:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-02 5:25 lilinzhe
2016-09-02 16:12 ` Stephen Hemminger
2016-09-02 16:31 ` Linzhe Lee
2016-09-02 16:51 ` Stephen Hemminger [this message]
2016-09-03 2:05 ` Linzhe Lee
2016-09-03 22:52 ` Ananyev, Konstantin
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