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

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Date:	Thu, 23 May 2013 17:26:14 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH V1 1/7] Drivers: hv: vmbus: Implement multi-channel
 support


> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Thursday, May 16, 2013 10:01 AM
> To: KY Srinivasan
> 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>
> 

James,

Please drop this patch-set. I fixed a couple of bugs in the vmbus support for multi-channel and I would need to resubmit this. Greg, I think it may make sense to first get the vmbus support checked in before I submit the storage related patches. There are networking related patches for multi-channel support that we will be submitting shortly. Getting the vmbus support in first would allow us to decouple network and storage patches. Greg, I will shortly submit the next version of the vmbus related patches for your consideration.

Regards,

K. Y

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