[Xen-devel] RE: [PATCH] Virtual machine queue NIC support in control panel

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

Yu,
Thanks for the patch
I don't know the python tools well enough to provide detailed comments on the 
patch.
I just have one high level comment. Using the term "vmq" in the domain 
configuration file or in commands like "vmq-attach" may give the user the wrong 
impression that a device queue will be dedicated to the vif. This may or may 
not be true depending on how many queues are available and how many other vifs 
are using them. It seems that we should allow the control tools to bind a vif 
to a NIC and let netback decide which vifs will use dedicated queues and which 
will share a common queue. Thus it seems that using a name like "pdev" is more 
appropriate than "vmq". Using a "pdev" parameter to associate a vif with a 
physical device can be used by accelerator plugins as suggested by Kieran. That 
said, in the future it will be useful to add commands to list vifs and vmq 
mappings and to pin vifs to a vmq, in a similar way we list and pin vCPUs.

Renato

> -----Original Message-----
> From: Zhao, Yu [mailto:yu.zhao@xxxxxxxxx]
> Sent: Thursday, January 31, 2008 1:14 AM
> To: Keir.Fraser@xxxxxxxxxxxx; Santos, Jose Renato G
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [PATCH] Virtual machine queue NIC support in control panel
>
> This patch enables virtual machine queue NIC support in
> control panel (xm/xend), so user can add or remove dedicated
> queue for a guest.
>
> Virtual machine queue is a technology for network devices,
> which intends to reduce the burden on the hypervisor while
> improving network I/O performance through the virtualized
> platform. Some vendors have lunched their products, like
> Intel(R) 82575/82598 (for more information of this
> technology:
> http://www.intel.com/technology/platform-technology/virtualiza
> tion/VMDq_whitepaper.pdf).
>
> This patch requires a vendor-specified utility to control the NIC.
>
> This patch also could be applied to netchannel2.
>
> Singed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
>

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