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The author of the original article is, at least for some of his tests: “(on an 8-core EC2 instance, c1.xlarge running Xen)”

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Yeah, true, rereading it he is not clear about whether he has run the software on xen on the same box he ran raw on, although it is implied. It is a very different question on EC2.

I've tried it on variety of different servers/hardware using both my server+apachebench and netperf as benchmarking tools.

* On EC2 I've tried the c1.xlarge and the giant cc1.4xlarge. With cc1.4xlarge, I saw maybe a ~10% increase accept() rate. * Two separate, virtualized servers at the office. * A private, virtualized server on Rackspace was briefly tested as well.

A compilation of netperf results are available at https://gist.github.com/985475

I doubt it'll reveal anything super useful, but running your tests on a single-tenant EC2 instance could add an extra datapoint. I suspect it'll only reveal that the problem _isn't_ due to EC2/Xen swapping your virtualized machine out. (assuming you haven't tried it already...)

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