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From: Rami Rosen <ramirose@gmail.com>
To: Alejandro Lucero <alejandro.lucero@netronome.com>
Cc: dev <dev@dpdk.org>
Subject: Re: [dpdk-dev] A Question about the necessity of DPDK VF for Ethernet PMDs
Date: Mon, 4 Feb 2019 14:19:19 +0200	[thread overview]
Message-ID: <CAHLOa7Qq97=QFyiF-WmAZbYE+bj_aDNxXcBC+Tx-8CDj9mrLjw@mail.gmail.com> (raw)
In-Reply-To: <CAD+H991KfTXwLSu4fco9W26m8LPqnQaYAG5k5yY-SUBjMigDDQ@mail.gmail.com>

Hi, Alejandro,

Thanks for you quick response.

>When SRIOV is used by VMs, the slow path will always be faster (and
>with lower latency) with DPDK.

Yes, I am referring primarily to the SRIOV case in my question, when
assigning PCI VF to a VM (most likely QEMU VM)
Can you please explain what you mean about slow path in this context ?

Not sure the OVS setup is relevant here, it seems (if I understand
correctly) that VFIO is more commonly used in OVS setups,
so this query is not relevant here (unless you use igb_uio which is less
common)
According to
http://docs.openvswitch.org/en/latest/intro/install/dpdk/
"VFIO is prefered to the UIO driver when using recent versions of DPDK. "
Regards,
Rami Rosen

  reply	other threads:[~2019-02-04 12:19 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-04  7:43 Rami Rosen
2019-02-04 10:22 ` Alejandro Lucero
2019-02-04 10:44   ` Rami Rosen
2019-02-04 11:30     ` Alejandro Lucero
2019-02-04 12:19       ` Rami Rosen [this message]
2019-02-04 12:53         ` Alejandro Lucero

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