Ubuntu – Incredibly high latency for Ubuntu guest on Hyper-V

hyper-vUbuntu

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:

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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

Best Answer

Since it's a new system, it may have needed to download and install quite a few updated packages. If the slowness is still present, try doing something like

ps -ef|grep apt

on the virtual machine to see if there's an apt-related process running. If the slowness suddenly resolved itself, it's worth checking /var/log/dpkg.log to see if a bunch of packages were installed, causing the slowness.

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