[Bug 195238] New: [Hyper-v] Enhance VMBUS and improve storage performance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195238

            Bug ID: 195238
           Summary: [Hyper-v] Enhance VMBUS and improve storage
                    performance
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kyliel at microsoft.com

Expect below features to enhance VMBUS and improve storage performance.
1) Signal optimization: The number of Interrupt for read/write is optimized.
2) Multi-channel: Originally, each device driver has one channel and all
channels are bound to vCPU0. Now each device driver (util still uses vCPU0)
could have one channel on one vCPU. 
3) Sub-channel for storage device: Get additional sub-chancel if having 5 and
above vCPUs. 
4) Scatter/gather list handling for immediate I/O request in storage driver

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