Hyper-V role makes the network speed 80% slower on Westmere CPUs (Xeon 56xx)

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• 11 มิถุนายน 2553 20:14

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  How are you determining your network throughput?

  What is the design of your test?

  I can tell you the following:

  If your managment NIC share teh same physical NIC as an External Virtual Network, then the network throughput of your management NIC will be 50% to 80% of the throughput that you would have if you were not sharing with an External Virtual Network.

  The culpret is the overhead of pumping the management network data through a virtual network.

  If you inturn configure your host to have a dedicated physical NIC for management (which is best practice) then you do not suffer the decreased throughput.

  I discovered this way back with the origional Hyper-V beta and it persists today.  Back then it was a 50% reduction, today it is less, but still a reduction.

   

  ---

  Brian Ehlert (hopefully you have found this useful)
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• 12 มิถุนายน 2553 17:09

   

   
  

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  Hello,

  I'm just copying a large file from the server to a workstation (windows regular share). No actual HyperV machines are configured. The Role itself, combined with Westmere CPUs and >32GB does some "harm" (slowdown in this case).

   

  Thanks,

  Saar

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• 17 มิถุนายน 2553 7:56

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  Hi,

   

  It seems that you only encountered issue with Intel X5670 processor and memory more than 32Gb on a Hyper-V enabled computer, so I suspect that there are some compatibility issue with the X5670 processor and Hyper-V, please update the BIOS of motherboard to the latest to see whether you get the same issue.

   

  By the way, you can add an extra physical network adapter to the Hyper-V host computer and then perform the same copy through this network adapter to check whether the issue persists.

   

  If the issue continues, you may need to contact Intel to perform the further research.

   

   

  Best Regards,

  Vincent Hu

   

  • ทำเครื่องหมายเป็นคำตอบโดย Vincent HuModerator 18 มิถุนายน 2553 6:45
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• 4 สิงหาคม 2553 22:25

   

   
  

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  Hello,

  I have same problem!

  My confuguration: Intel S5620HC, 2 x Intel E5630, 48Gb RAM

  After installing Hyper-V role i have only 10-20% from original (whitout Hyper-V) inbound network speed (outbound speed is still good).

  I use latest BIOS on motherboard (6.0 package from IDA) and latest intel network drivers (15.5).

  MS hotfix 981791 didn't help.

  Do you have any suggestion?

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• 5 กุมภาพันธ์ 2554 5:05

   

   
  

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  I have a similar problem.  I have 9 servers all running server 2008R2.  The problem is that I am loosing pings between VM's on one host and VM's on another host.  The VM's are all server 2003.  This problem has been going on for about 5 months now and I have tried everyting.  Reloading the Hosts, reloading the VM's, different BIOS versions, different NIC software versions, Firmware version, $500 nic cards, different switches both gig and 100mb.  Chipset versions.  IF it can be changed or upgraded I have tried it.  I have reloaded or changed every driver and every version of BIOS that the manufactures have available.  The server main boards are the Intel 5520HC(R) and the Supermicro X8DTN+-F.  Last week I stumbled on the problem.  It sees that if the servers are runnig the intel 56xx series CPU's I have the problem.  I changed them out for Intel 55xx CPU's and the problem goes away.  Completely away.  Put the 56xx back and the problem is back. 

  The second issue is also with the 56xx CPUs   Host a and Host b can transfer files over the gig switch at about 110mb as long as the Hyper-v role is not installed. Install Hyper-v and this transfer drops to 15mb.  Remove Hyper-v and I am back to 110mb. Change the CPUs to 55xx and the problem goes away. 

  Does anyone have any idea what is going on? 

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• 4 กันยายน 2554 17:04

   

   
  

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  Since nobody closed this thread, I thought I'd try and pitch in.  This is a known problem and there is a MSFT supplied hotfix:

  http://support.microsoft.com/kb/2517329

  Regards,
  Brandon

  • เสนอเป็นคำตอบโดย Paulo Hecko 23 เมษายน 2555 20:34
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• 23 เมษายน 2555 20:36

   

   
  

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  Applying patch proposed by Brandon resolved my problem on HP BLC460C with Intel x5670 processors w/ Hyper-V role.

  Thanks.

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