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Exam 70-740 topic 1 question 200 discussion

Actual exam question from Microsoft's 70-740

Question #: 200
Topic #: 1

HOTSPOT -
You deploy a new Hyper-V host named Server1 that runs Windows Server 2016.
You implement receive side scaling (RSS) on Server1. The chipset on Server1 does not support NetDMA.
All of the equipment on your network supports 10-Gbps connectivity.
On Server1, you deploy a virtual machine named VM1. You configure VM1 to aggregate all of the Windows and non-Windows log files for all of the servers on the network. VM1 has four virtual processors.
You discover that VM1 drops packets.
You monitor the network, and you discover that the network capacity is sufficient for the monitoring traffic.
You monitor the performance of VM1, and you discover that one processor is consistently at 100 percent utilization, while the other processors are barely in use.
You need to resolve the performance issue.
What should you do? To answer, select the appropriate options in the answer area.
Hot Area:

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Suggested Answer:

References:
https://docs.microsoft.com/en-us/windows-server/networking/technologies/vrss/vrss-top

by hkshado at Oct. 7, 2019, 9:35 a.m.

Comments

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Omurray

4 years, 5 months ago

"RSS cannot be enabled on the network adapter when SR-IOV or VMQ ids Enabled"

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V1980

4 years, 10 months ago

70-741

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jam7272

4 years, 11 months ago

I think vRSS and VMQ - VRSS needs VMQ to work. The purpose of vRSS is to balance load on CPU across all virtual processors. Not sure, but I think it's the best option.

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MarianoD

4 years, 11 months ago

I Think VMQ and vRSS because: 1) TCP Chimney Offload are deprecated in Windows Server 2016. https://docs.microsoft.com/EN-US/windows-server/networking/technologies/network-subsystem/net-sub-performance-tuning-nics 2) To use vRSS there is no Single Root Input-Output Virtualization (SR-IOV) configured for the VM. https://docs.microsoft.com/EN-US/windows-server/networking/technologies/vrss/vrss-plan 3) vRSS is dependent on Virtual Machine Queue (VMQ) in the Hyper-V host and RSS in the VM or on the host vNIC. https://docs.microsoft.com/en-us/windows-server/networking/technologies/vrss/vrss-top

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eyeteegrunt

4 years, 11 months ago

so whats the answer to this one? is it VMQ and vRSS?

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mazintaha

5 years ago

an update to my first idea this is what i came up to for the first answer: SR-IOV cannot be enabled for -VM!- only for Server, right, so scratch that option vRSS cannot be enabled for -VM and Server!- only for VM, right, so scratch this option too and now we are left with TCP Chimney Offload on Server1, which is indeed can be enabled on server .. for the second answer: using the same concept, TCP Chimney .... cannot be enabled on VM!, only on Server, right vRSS cannot be enabled on VM!, only on server, right SR-IOV can be enabled on Server1, soit will be the answer

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mazintaha

5 years ago

As Aldrid mentioned "If VMQ is disabled or not supported, then vRSS is disabled" .. and clearly this is a processors utilization division problem "and you discover that one processor is consistently at 100 percent utilization, while the other processors are barely in use" so i vote for VMQ the vRSS

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Craig92866

5 years, 2 months ago

Enabling VMQ should occur on the host but NOT the host and VM. Since it's not enabled on both, the fourth answer is incorrect. https://docs.microsoft.com/en-us/windows-server/networking/technologies/vrss/vrss-top vRSS is dependent on Virtual Machine Queue (VMQ) in the Hyper-V host and RSS in the VM or on the host vNIC.

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glukken

5 years, 5 months ago

Wrong answer. This is the exact same question as 165, but there the (wrong) answer is Chimney Offload and vRSS, but as noted in the comments of 165, it should be VMQ and vRSS. In this question it's also stated that the host has RSS, although the hardware doesn't support NetDMA (which is also possible as there is no mention anywhere that NetDMA is required). So NetDMA also has nothing to do with the possible enabling of VMQ , and as VMQ is required for vRSS, it should be VMQ and vRSS

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darkknight

5 years, 3 months ago

Q165 had packet drop while this question is about processor utilization

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rjc

5 years, 5 months ago

I'm guessing on the following facts: 1. vm1 has 4 processors 2. vm1 drops packets 3. Monitor traffic... sufficient bandwidth 4. 1 of the CPUs on vm1 is at a 100% https://apttech.wordpress.com/2018/02/26/using-netsh-command-to-view-tcp-chimney-offload-in-the-operating-system/ Would it be off loading? TCP Chimney Offload is a networking technology that helps transfer the workload from the CPU to a network adapter during network data transfer (source: Microsoft)

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Aldrid

5 years, 6 months ago

SR-IOV enables virtual machines to share the hardware resources of a PCI Express device, such as a network adapter

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Aldrid

5 years, 6 months ago

REQ for vRSS Physical network adapters must support Virtual Machine Queue (VMQ). If VMQ is disabled or not supported, then vRSS is disabled for the Hyper-V host and any VMs configured on the host. Network adapters must have a link speed of 10 Gbps or more. Hyper-V hosts must be configured with multiple processors or at least one multi-core processor to use vRSS. Virtual machines (VMs) must be configured to use two or more logical processors.

upvoted 4 times

lbs

5 years, 2 months ago

I agree. VMQ first then vRSS second.

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Aldrid

5 years, 6 months ago

https://docs.microsoft.com/ru-ru/windows-server/networking/technologies/vrss/vrss-top vRSS: This configuration allows the load from a virtual network adapter to be distributed across multiple virtual processors in a virtual machine (VM), allowing the VM to process more network traffic more rapidly than it can with a single logical processor. vRSS is dependent on Virtual Machine Queue (VMQ) So first Action is turn on VMQ, Second - vRSS

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Ledance

5 years, 6 months ago

The first action is enable TCP..............

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coleman

5 years, 8 months ago

Virtual machine queue (VMQ) is a feature available to computers running the Hyper-V server role installed, that have VMQ-capable network hardware. VMQ uses hardware packet filtering to deliver packet data from an external virtual machine network directly to virtual machines, which reduces the overhead of routing packets and copying them from the management operating system to the virtual machine. To deploy VMQ, you have to enable VMQ on host OS and Virtual Machine.

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coleman

5 years, 8 months ago

so...the first action is ...VMQ

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hkshado

5 years, 8 months ago

For the first action, it should be enabling VMQ. https://docs.microsoft.com/en-us/windows-server/networking/technologies/vrss/vrss-top The above link stated "vRSS is compatible with all other Hyper-V networking technologies. vRSS is dependent on Virtual Machine Queue (VMQ) in the Hyper-V host and RSS in the VM or on the host vNIC." This means to use vRSS, VMQ need to be enabled on host first. "Unfortunately, Anthony does not have the option of turning on SR-IOV because his VMs rely on policy enforcement through the virtual switch he created with Hyper-V Virtual Switch manager. Because of this, Anthony decides to use vRSS instead of SR-IOV." This means if we can use SR-IOV, we do need to use vRSS.

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