RE: [PATCH V1 1/7] Drivers: hv: vmbus: Implement multi-channelsupport

From: KY Srinivasan
Date: Thu May 23 2013 - 13:28:29 EST

> -----Original Message-----
> From: Greg KH [mailto:gregkh@xxxxxxxxxxxxxxxxxxx]
> Sent: Thursday, May 16, 2013 10:01 AM
> To: KY Srinivasan
> Cc: linux-kernel@xxxxxxxxxxxxxxx; devel@xxxxxxxxxxxxxxxxxxxxxx;
> ohering@xxxxxxxx; jbottomley@xxxxxxxxxxxxx; hch@xxxxxxxxxxxxx; linux-
> scsi@xxxxxxxxxxxxxxx; apw@xxxxxxxxxxxxx; jasowang@xxxxxxxxxx
> 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@xxxxxxxxxxxxx>
> > Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>


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.


K. Y

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