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I have some virtual machines servers with some micro-services and do some load tests with JMeter. All the servers including the JMeter machine are sharing the same virtual network. The virtual network has no adapters:

enter image description here

The problem is that it seems to be a ceiling on traffic throughput at 320Mbit/sec (iftop -i interface): enter image description here

I set up the traffic shaping very big just to be sure that it doesn't put any limitation enter image description here How can I increase the throughput of my virtual network to go over this 320Mbit/sec limitation?

Eduard Florinescu
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  • What's the host spec? You should easily be able to handle multiple 10Gbps traffic flows with this setup - have you installed the latest vmtools into each guest? – Chopper3 Aug 18 '16 at 12:34
  • @Chopper3 HP ProLiant BL460C Gen9 20 CPUs x 2.297 GHz all virtual servers have 4CPUs and VMXNET3 interfaces – Eduard Florinescu Aug 18 '16 at 12:42
  • Very odd, we have the same blade and don't seem to be getting that kind of issue - you're on ESXi 6.0u2 right? have you tried any other test tool? – Chopper3 Aug 18 '16 at 12:45
  • @Chopper3 I tested on another server with real 1Gbit interfaces and the tools could keep up with the bandwidth – Eduard Florinescu Aug 18 '16 at 12:57
  • I'd still be tempted to test using some other tool or another - almost anything else, just in case there's something odd about it - feel free to show us more vSS details if you like. – Chopper3 Aug 18 '16 at 12:58
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    ah - thanks for that update - why have you set ANY traffic shaping unless you need it - it's computationally 'expensive' - disable it and retest please – Chopper3 Aug 18 '16 at 13:09
  • @Chopper3 the problem was indeed with one of my tools, now I can get 10.6Gb, can you put your comment as an answer so I can accept it – Eduard Florinescu Aug 18 '16 at 13:26

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You seem to have solved the tool issue, I might add that for maximum performance inside a vSwitch in VMware, make sure that you're running the latest vmtools and VMXNET3 adapters (the legacy e1000 adapters are kinda slow comparatively).

Here's an interesting comparison; http://rickardnobel.se/vmxnet3-vs-e1000e-and-e1000-part-2/

Stuggi
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