patches for DPDK stable branches
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From: Raslan Darawsheh <>
To: Slava Ovsiienko <>, "" <>
Cc: Matan Azrad <>, "" <>
Subject: Re: [dpdk-stable] [PATCH] net/mlx5: fix external buffer pool registration for Rx queue
Date: Sun, 21 Feb 2021 08:14:12 +0000
Message-ID: <> (raw)
In-Reply-To: <>


> -----Original Message-----
> From: Viacheslav Ovsiienko <>
> Sent: Friday, February 12, 2021 1:07 PM
> To:
> Cc: Raslan Darawsheh <>; Matan Azrad
> <>;
> Subject: [PATCH] net/mlx5: fix external buffer pool registration for Rx queue
> On Rx queue creation the mlx5 PMD registers the data buffers of the
> specified pools for DMA operations. It scans the mem_list of the pools
> and creates the MRs (DMA related NIC objects) for the chunks found.
> If the pool is created with rte_pktmbuf_pool_create_extbuf() and
> refers to the external attached buffers (whose are in the area of
> application responsibility and it should explicitly register the
> data buffer memory for DMA with rte_dev_dma_map() call) the chunks
> contain the mbuf structures only, w/o any built-in data buffers.
> Hence, DMA with mlx5 NIC never happens to this area and there is
> no need to create MRs for these ones.
> The extra not needed MRs were created for the pools with external
> buffers causing MR cache load and performance was slightly affected.
> The patch checks the mbuf pool type and skips MR creation for the
> pools with external buffers.
> Fixes: bdb8e5b1ea7b ("net/mlx5: allow allocated mbuf with external buffer")
> Cc:
> Signed-off-by: Viacheslav Ovsiienko <>
> ---

Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh

      parent reply	other threads:[~2021-02-21  8:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-12 11:06 Viacheslav Ovsiienko
2021-02-14 10:42 ` Matan Azrad
2021-02-21  8:14 ` Raslan Darawsheh [this message]

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