linux-kernel - Re: [PATCH V1 1/7] Drivers: hv: vmbus: Implement multi-channel support

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Date:	Thu, 16 May 2013 10:01:13 -0400
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	ohering@...e.com, jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, apw@...onical.com, jasowang@...hat.com
Subject: Re: [PATCH V1 1/7] Drivers: hv: vmbus: Implement multi-channel
 support

On Thu, May 16, 2013 at 05:21:13AM -0700, K. Y. Srinivasan wrote:
> Starting with Win8, the host supports multiple sub-channels for a given
> device. As in the past, the initial channel offer specifies the device and
> is associated with both the type and the instance GUIDs. For performance
> critical devices, the host may support multiple sub-channels. The sub-channels
> share the same type and instance GUID as the primary channel. The number of
> sub-channels offerrred to the guest depends on the number of virtual CPUs
> assigned to the guest. The guest can request the creation of these sub-channels
> and once created and opened, the guest can distribute the traffic across all
> the channels (the primary and the sub-channels). A request sent on a sub-channel
> will have the response delivered on the same sub-channel.
> 
> At channel (sub-channel) creation we bind the channel interrupt to a CPU and
> with this sub-channel support we will be able to spread the interrupt load
> of a given device across all available CPUs.
> 
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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