[ovs-dev] [PATCH] INSTALL.DPDK.md: vhost-user: Note about number of queues inside guest OS.

Stokes, Ian ian.stokes at intel.com
Tue Feb 9 10:02:12 UTC 2016


Hi Ilya,

I've submitted a patch for this last week which is waiting on review if you'd like to provide feedback for it

http://openvswitch.org/pipermail/dev/2016-February/065739.html

Thaks
Ian

> -----Original Message-----
> From: dev [mailto:dev-bounces at openvswitch.org] On Behalf Of Ilya
> Maximets
> Sent: Tuesday, February 09, 2016 9:52 AM
> To: dev at openvswitch.org; Daniele Di Proietto
> Cc: Ilya Maximets; Flavio Leitner; Dyasly Sergey
> Subject: [ovs-dev] [PATCH] INSTALL.DPDK.md: vhost-user: Note about
> number of queues inside guest OS.
> 
> Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
> ---
>  INSTALL.DPDK.md | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md index d892788..250ca7a
> 100644
> --- a/INSTALL.DPDK.md
> +++ b/INSTALL.DPDK.md
> @@ -586,6 +586,15 @@ Follow the steps below to attach vhost-user port(s)
> to a VM.
>     -device virtio-net-
> pci,mac=00:00:00:00:00:02,netdev=mynet2,mq=on,vectors=$v
>     ```
> 
> +   Also, driver in guest operating system must be configured to use
> exactly
> +   same number of queues. If number of queues will be less, some
> packets
> +   will get stuck in queues unused by guest and will not be received.
> +   This can be done for linux kernel virtio-net driver with:
> +
> +   ```
> +   ethtool -L <interface> combined $q
> +   ```
> +
>  DPDK vhost-cuse:
>  ----------------
> 
> --
> 2.5.0
> 
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