Incredibly high latency for Ubuntu guest on Hyper-V

Posted by Mark Henderson on Server Fault See other posts from Server Fault or by Mark Henderson
Published on 2011-11-20T22:11:30Z Indexed on 2011/11/21 1:54 UTC
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ubuntu

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hyper-v

I've got several Ubuntu 10.04 virtual machines running as Hyper-V guests on Windows Server 2008 R2 SP1 and they're all perfectly fine.

Today I installed my first Ubuntu 11.10 virtual machine and I'm seeing rediculous pings:

enter image description here

These servers are all connected via gigabit to a local LAN, with almost no network traffic at all¹, with a legacy network adapter in Hyper-V.

I'm a bit of an Ubuntu n00b so I don't really know where to go from here. Any ideas?

free -m reports:

             total       used       free     shared    buffers     cached
Mem:           485        470         15          0         63        299
-/+ buffers/cache:        107        378
Swap:          507         20        487

This is within a few mb of our other Ubuntu servers that are on 10.04.

I removed the Legacy NIC and installed a Synthetic one in Hyper-V and this did improve the numbers, in that they're around 10-30ms now, but I would still be expecting <1ms response times.

_{¹As a comparison, I have another Ubuntu 10.04 guest on Hyper-V almost 1,000km away that has a ping of 33ms}

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