Considerations for Maximizing UDP Performance

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Continuing the network performance theme… Boon Seong Ang, Senior Staff Engineer for VMkernel IO, wrote the following response to one of our SEs. The SE’s customer was experiencing some virtual network performance issues with UDP.  Considerations for virtual network performance: (1) vNIC types: do not use vlance.  vlance is our oldest vNIC and does not Read more...

Line Rate 10GigE

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I blogged recently (or should I say, Mark Pariente did) about virtual switch performance. Howie Xu, our Director of R&D for VMkernel IO remarked recently that after talking with a few customers, many are still unaware we can achieve line rate 10GigE performance on ESX 3.5. I guess they haven’t read “10Gbps Networking Performance on Read more...

More on the vSphere 4 Launch

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Today’s launch of vSphere 4 featured a veritable who’s who of the industry with Paul Maritz (CEO, VMware) and Joe Tucci (Chairman, VMware and CEO, EMC); John Chambers (President and CEO, Cisco), Michael Dell (CEO, Chairman of Dell); Pat Gelsinger (SVP, Intel). Steve Herrod (CTO, VMware) demonstrated vSphere to the assembled masses. I managed to Read more...

vSphere 4 Launches!

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It all happened today … the launch of vSphere 4. If you’ve been following the announcements beginning back at VMworld in September last year, you will know about many of the new virtual networking features incorporated under the banner of vNetwork in vSphere 4. Just a few of these: vNetwork Distributed Switching. You now have Read more...

Virtual Switch Performance and Overhead

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I’ve seen a few emails from our field fly by recently on the subject of virtual switch performance in ESX. It seems a few folks are operating under the impression that more vswitches equates to better performance (note: it doesn’t). Mark Pariente, one of senior engineers gave me some more detail. Here is his explanation: Read more...