Add FreeBSD Integration Services entry from Dexuan Cui
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Benjamin Kaduk
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2020-12-08 03:00:23 +00:00
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@ -2206,4 +2206,134 @@
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</task>
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</help>
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</project>
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<project cat='kern'>
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<title>&os; Integration Services (BIS) </title>
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<contact>
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<person>
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<name>
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<given>Dexuan</given>
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<common>Cui</common>
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</name>
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<email>decui@microsoft.com</email>
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</person>
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<person>
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<name>
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<given>Hongjiang</given>
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<common>Zhang</common>
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</name>
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<email>honzhan@microsoft.com</email>
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</person>
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</contact>
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<links>
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<url href="https://wiki.FreeBSD.org/HyperV">&os; Virtual Machines on Microsoft Hyper-V</url>
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<url href="https://technet.microsoft.com/en-us/library/dn531030.aspx">Linux and &os; Virtual Machines on Hyper-V</url>
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</links>
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<body>
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<p>When &os; virtual machines (VMs) run on Hyper-V, in order
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to get the best network and storage performance and make full use
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of all the benefits that Hyper-V provides, it is recommended to
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use Hyper-V synthetic devices. The collection of drivers that are
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required to run Hyper-V synthetic devices in &os; are known as
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&os; Integration Services (BIS). Some of the BIS drivers (like
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network and storage drivers) have existed in &os; 9.x and 10.x for
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years, but there are still some performance and stability issues
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and bugs. Additionally, compared with Windows and Linux VMs, the
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current BIS lacks some important features, such as the virtual
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Receive Side Scaling (vRSS) support in the Hyper-V network driver
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and the support for UEFI VM (boot from UEFI), among others.</p>
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<p>We are now working more on the issues and performance
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tuning to make &os; VM run better on Hyper-V and the Hyper-V based
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cloud platform Azure.</p>
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<p>Our work during 2015Q4 is documented below:</p>
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<ul>
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<li>Optimizing the VMBus driver and Hyper-V network driver
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for performance:
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<ul>
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<li>Sent out patches to enable <tt>INTR_MPSAFE</tt> for
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the interrupt handling thread, speed up
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relid-to-channel lookup in the thread by map table,
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and optimize the VMBus ringbuffer writable
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notification to the host.</li>
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<li>Developing a patch to enable the virtual Receive
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Side Scaling (vRSS) for Hyper-V network device driver.
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This will greatly improve the network performance for
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SMP virtual machine (VM).</li>
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<li>Sent out a patch to enable the Hyper-V timer, which
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will improve the accuracy of timekeeping when &os; VMs
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run on Hyper-V.</li>
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</ul>
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</li>
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<li>Fixing bugs and cleaning up the code:
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<ul>
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<li>Fixed a bug in checksum offloading (PR 203630
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— [Hyper-V] [nat] [tcp] 10.2 NAT bug in TCP stack
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or hyperv netsvc driver) in the Hyper-V network driver,
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making &os; VM based NAT gateways work more reliably.</li>
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<li>Fixed a serialization issue in the initialization of
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VMBus devices, fixing PR 205156 ([Hyper-V] NICs' (hn0,
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hn1) MAC addresses can appear in an uncertain way across
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reboot).</li>
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<li>Fixed a KVP (Key-Value Pair) issue (retrieving a
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key's value can hang for an uncertain period of
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time).</li>
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<li>Added ioctl support for SIOCGIFMEDIA for the Hyper-V
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network driver, fixing PR 187006 ([Hyper-V] dynamic
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address (DHCP) obtaining doesn't work on HYPER-V OS
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2012 R2).</li>
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<li>Sent out patches to add an interrupt counter for
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Hyper-V VMBus interrupts (so the user can easily get
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the statistical information about VMBus interrupts),
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and fix the KVP daemon's poll timeout (so the daemon
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will avoid unnecessary polling every 100
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milliseconds.</li>
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<li>Identified a TSC calibration issue: the i8254 PIT
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timer emulation of Hyper-V is not fully reliable, so
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the Hyper-V time counter should be used to calibrate
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the TSC. A patch was drafted. With the patch, it looks
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the warning kernel message (e.g., "calcru: runtime
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went backwards from 46204978 usec to 23362331 usec for
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pid 0 (kernel)") will go away, and the time-based
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tracing of Dtrace will be more accurate.</li>
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</ul>
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</li>
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<li>We plan to add support for UEFI VMs (a.k.a., Hyper-V
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Generation-2 VMs). Currently some issues and to-do items were
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identified: e.g., we cannot use the i8254 PIT to calibrate the
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TSC because the i8254 PIT does not exist in a UEFI VM, and we
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need to add support for the Hyper-V synthetic
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keyboard/mouse/framebuffer device.</li>
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<li>We are working on a disk detection issue: when a &os; VM
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runs on a Windows Server 2016 Technical Preview host, the VM
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will detect 16 disks whereas only 1 disk is configured for the
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VM. Due to this issue, VMs running on these hosts can fail to
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boot. A workaround patch was made and we are trying to make a
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formal fix.</li>
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<li>We are tidying up some internal BIS test cases and plan
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to publish them on github.</li>
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</ul>
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</body>
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<sponsor>
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Microsoft
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</sponsor>
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</project>
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</report>
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