Bandwidth not unrestricted?

In Hyper-V Settings for Network Adapter we are told "To leave the minimum or maximum unrestricted specify 0 as the value." So why can't they both be 0? If one of them should be non-zero which one and how much is appropriate?  (I'm trying anything I can to try to get my Networking working again after some recent updates broke it--no gateway, etc.  FWIW I just set it to Min 500 Max 0 and that was accepted but I have no idea if 500 is sensible Minimum or not.  I would be even more clueless about setting a sensible Max.)

May 26th, 2015 3:00pm

Hi Robert,

I think no need to tangle too much on this : ) , the word or might be little confusing. Of course we could set them to 0, so the bandwidth manager would be meaningless even we enabled it.

About the appropriate number, it is hard to define. I think it is depending on that what to do with your virtual machine. The main purpose adding this feature to Hyper-v is that you may have very noisy virtual machines that consume a lot of bandwidth, and they can be stepped down yet still given an adequate amount of connectivity.

To measure the individual VM bandwidth management options for Hyper-V, we need more practice and sharing comment from users with different kind of environment.

Here are some of I picked

If multiple virtual machines are in use on a Hyper-V host, and each of them have maximum values that all together exceed the bandwidth of the host's physical network connectivity on the External virtual switch, the contention also would slow down the actual Hyper-V host's connectivity

The setting comprises two parts, namely minimum and maximum bandwidth. Both of these bandwidth limits are measured in megabits per second

Let say in previous version, you have 4 Virtual Machines running and share on 1 Gbps NIC. Will each Virtual Machine consume and limited to 250 Mbps? Well not really. Some VM will consume more throughput than 250 Mbps and will eventually impact the performance for the rest of the VM.

Regards,

D. Wu

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May 29th, 2015 4:03am

If multiple virtual machines are in use on a Hyper-V host, and each of them have maximum values that all together exceed the bandwidth of the host's physical network connectivity on the External virtual switch, the contention also would slow down the actual Hyper-V host's connectivity

In contrast my situation is using Hyper-V to run W10TP (10122 currently).  So, since it is only me driving one interactive application or another, I am content letting the one I am using have whatever bandwidth the host would normally give one of its applications.  Then does this mean I should let the VM run unconstrained from the Hyper-V Manager's point of view?

BTW I probably should have titled this thread more honestly to being "Help me get my VM's Networking going again after a W8.1.2 update screwed it up."  This Bandwidth question was just a stab in the dark for that.  And I am still no closer to understanding why it was broken.  However, it is appearing to me that it may be because both the host and the VM retain information unnecessarily about previous configurations.  I think if I could erase all that knowledge I would be closer to a solution for my real problem.

This tack is hinted at in this report

C.f.

http://www.virtualizationadmin.com/articles-tutorials/microsoft-hyper-v-articles/general/troubleshooting-common-hyper-v-errors-part2.html 

In a way mine might be something like that because one of the things that got run by the host was another instance of a Surface firmware update (an analog to the blogger's power surge frying his system? <eg>).  That thing keeps running at the end of every month it seems and never really gets applied properly.  However, I'm hoping that this month it may actually have done something useful finally, but apparently at the expense of screwing up my VM's networking.  (BTW it would be helpful to know if there is a validation procedure for it too.)

What would you like me to do, start a new thread about that or retitle this one?

Thanks for your help.

May 29th, 2015 11:13am

Before you go off messing with obscure Registry edits, have you done basic troubleshooting like deleting and recreating your virtual switch, driver updates, etc?

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May 29th, 2015 6:48pm

Before you go off messing with obscure Registry edits, have you done basic troubleshooting like deleting and recreating your virtual switch, driver updates, etc?


Yes.  But rather than Registry edits (which I have seen suggested) I was hoping to find equivalent netsh or PowerShell procedures.  E.g. ipconfig  shows stuff that I'm not sure is valid so I would like to reset that if only to see that the AutoConfig stuff is really working, even if it just echoes what is already there after I clear it out.
May 29th, 2015 7:07pm

Hi Robert

Thanks for your feedback and I'd suggest we post your issue in new thread which has more relevant title and start with your actual issue with some details on it. So we might get more effective suggestion from other users. Your understanding is highly appreciated.

Regards,

D. Wu

Free Windows Admin Tool Kit Click here and download it now
May 31st, 2015 10:31pm

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